Glossary of magnetic terminology
How to navigate the world of neodymium magnets?
Hello to our detailed glossary focused on the fascinating world of neodymium magnets. As a recognized supplier in providing high-quality magnetic solutions, we know how essential it is to have a solid knowledge about the basic notions in this unique field. This glossary has been thoughtfully crafted to serve as an invaluable source of information for everyone who is curious about magnets – regardless of whether you are an expert, a hobbyist, or a person intrigued by the applications of magnets.
In our glossary, you will find accessible and detailed explanations of important notions and ideas related to neodymium magnets. From the mechanisms behind magnetic functions and magnetic induction, to material characteristics and material grades, each definition has been designed to expand your understanding and make accessible even the most complex ideas. If you are exploring industrial applications, conducting scientific experiments, or simply learning magnetism, this glossary will be your reliable guide.
Discover the captivating world of neodymium magnets with confidence. Expand your knowledge, gain fresh perspectives, and discover the applications of these innovative materials, reading about and concepts that influence their versatility and utility. Consider this glossary as your partner in navigating the developing domain of magnetic technology.
Litera: A
The air gap is the distance filled with air that separates a magnet from a ferromagnetic material. Increasing the gap weakens the attractive force. Formula: B = μ0(H - M), where:
B - magnetic induction,
μ0 - permeability of free space,
H - magnetic field strength,
M - magnetization.
B - magnetic induction,
μ0 - permeability of free space,
H - magnetic field strength,
M - magnetization.
An anisotropic material, such as neodymium magnets, has properties that vary with direction. Magnets with a preferred magnetization direction are more efficient than uniform magnets, but they can only be magnetized in one direction.
Annealing is a heat treatment process in magnetic materials. It is performed under controlled conditions, usually in a protective atmosphere to prevent oxidation. Annealing improves the structure and allows the material to be tailored to application requirements.
Axial magnetization means that the magnetic poles are located at opposite ends of the magnet, and the magnetic field lines run along the length of the magnet. This configuration is commonly used in ring-shaped and spherical magnets. Formula: Bz = (Br/2) × [(L + 2z) / (L² + 4z²)0.5 - (L - 2z) / (L² + 4z²)0.5].
Litera: B
Magnetic induction B is the amount of magnetic flux passing through a surface. It is measured or gauss. Formula: B = μ0(H + M), where:
μ0 - permeability of free space,
H - applied magnetic field,
M - magnetization.
μ0 - permeability of free space,
H - applied magnetic field,
M - magnetization.
The hysteresis loop is a chart of the relationship between magnetic induction (B) and field strength. It helps determine properties like coercivity. The hysteresis loop is a fundamental tool in evaluating materials used in transformers.
Remanent induction Bd is the residual magnetic field in a material after the external magnetic field is removed. It is measured in teslas and represents the material's ability to retain magnetism.
The slope of the operating line, denoted as Bd/Hd, is the a coefficient describing magnetic permeability. Formula: Bd/Hd = (Br - Hd) / Hd. This is a key parameter in the design of magnetic circuits.
Bg represents the level of magnetic field in the air gap. It is a important factor in designing devices based on magnetic circuits. Formula: Bg = Φ / A, where:
Φ - magnetic flux,
A - air gap area.
Φ - magnetic flux,
A - air gap area.
Litera: C
The C.G.S. system of units is one of the oldest measurement systems. Although it has been replaced by the MKSA (SI) system, C.G.S. is still relevant in historical and specialized analyses. This system includes units for magnetizing force and magnetic induction.
A closed circuit refers to a configuration where the magnetic flux forms a complete loop. It uses magnetic components to ensure continuity of magnetic field flow. Such circuits are essential in applications requiring controlled magnetic fields.
Coercive force, denoted as Hc, is the field intensity required to demagnetize a material. This parameter measures the durability of its magnetic properties. Formula: Hc = -M/χ, where:
M - magnetization,
χ - magnetic susceptibility.
M - magnetization,
χ - magnetic susceptibility.
High coercivity indicates the durability of a material's magnetic properties. This parameter is critical in designing permanent magnets for motors and generators.
Intrinsic coercivity, denoted as Hci or iHc, represents the material's resistance to losing magnetization. It measures the demagnetizing force acting on intrinsic induction (Bi). Materials with high coercivity offer magnetic stability.
Curie temperature is the point at which ferromagnetic materials lose their magnetic properties. Beyond this temperature, the magnetic structure becomes disordered. Formula: Tc = (2kB / μ0) × J02 / χ, where:
kB - Boltzmann constant,
J0 - magnetic moment.
kB - Boltzmann constant,
J0 - magnetic moment.
Litera: D
Demagnetization refers to the process of weakening residual induction in a material. Methods include or employing demagnetization techniques such as degaussing. This process is essential in applications requiring complete removal of magnetic properties.
The demagnetization curve illustrates the relationship through cycles of magnetization and demagnetization. It reveals the material's hysteresis characteristics, including stability of magnetic properties. This tool is commonly used in designing magnetic circuits.
Demagnetization force refers to the opposing magnetic field that induces demagnetization. This force allows for controlling the level of magnetization in materials.
A demagnetized material is one where all residual magnetization has been removed. This state is achieved through applying alternating magnetic fields. Demagnetization is important in eliminating unwanted magnetic effects.
approximately 7.5 g/cm³, is one of the key parameters defining its magnetic properties. Density can be approximately determined using the formula:
ρ = m / V, where:
ρ - density (in g/cm³ or kg/m³),
m - mass of the magnet (in grams or kilograms),
V - volume of the magnet (in cm³ or m³).
Example: For a magnet with a mass of 150 g and a volume of 20 cm³, the density is:
ρ = 150 / 20 = 7.5 g/cm³.
Knowing the density helps predict the magnet's strength and durability.
ρ = m / V, where:
ρ - density (in g/cm³ or kg/m³),
m - mass of the magnet (in grams or kilograms),
V - volume of the magnet (in cm³ or m³).
Example: For a magnet with a mass of 150 g and a volume of 20 cm³, the density is:
ρ = 150 / 20 = 7.5 g/cm³.
Knowing the density helps predict the magnet's strength and durability.
Diamagnetic materials exhibit weak repulsion to magnetic fields. When exposed to an external field, they produce a repelling effect. This behavior results from induced currents within the material.
Diameter refers to the distance between the farthest points across the surface of or other geometric shape. It is a critical parameter in ensuring precise component alignment.
Diametrically magnetized magnets have creating a circular magnetic field pattern. They are commonly used in applications requiring radial or rotational interactions.
Dimensional tolerance specifies the acceptable deviation from specified dimensions. It is crucial for integrating magnetic components into systems.
Dimensions refer to the such as length, width, height, or diameter of a magnet. Accurate dimensioning is essential for system design.
The direction of magnetization defines the path along which the magnetic field is established. This is a critical feature that affects field interactions with other elements.
Domains are zones within a magnetic material where creating localized magnetic fields. They can be altered by external magnetic fields, temperature, or stress.
Litera: E
Eddy currents are electrical currents induced in conductive materials when exposed to fluctuations in the magnetic field. They cause efficiency issues. The use of laminated cores or magnetic shielding minimizes their impact and enhances performance.
An electromagnet is a magnet created by passing an electric current through a conductor. The strength of the magnetic field depends on the current. Electromagnets are widely used in industries and technologies.
The energy product is an indicator of a magnet's ability to supply energy. It is calculated as the multiplication of two parameters from the demagnetization curve. Expressed in MGOe (Mega Gauss Oersteds) or kJ/m³, it is a critical parameter for evaluating their efficiency in applications.
Measured as the product of the material's remanence and coercivity. This parameter is essential in evaluating the performance and strength of a magnet in industrial applications.
Litera: F
Ferrites are substances primarily composed of iron oxide (Fe2O3). They combine low electrical conductivity with high magnetic permeability. Used in transformers, inductors, and telecommunication devices.
A ferromagnetic material is characterized by its ability to amplify magnetic flux. In such materials, atoms align parallel under an external magnetic field. Examples include and their alloys. They are widely used due to their ability to retain magnetization.
Flux density, denoted as represents the amount of flux passing through a unit area. Measured in Teslas (T) or Gauss (G), it is a crucial parameter for designing magnetic systems.
A fluxmeter is used to measure magnetic induction (B). It employs various technologies such as the Hall effect or rotating coil techniques. It is a critical engineering tool.
Litera: G
Gauss is a unit of magnetic induction. One Gauss (G) equals 10^-4 Tesla (T). A historically popular unit.
A Gauss meter is a instrument used to determine induction at points in space. It uses Hall effect sensors. It is used in many branches of engineering and science.
The Gilbert is named after William Gilbert, a pioneer in magnetic research. One Gilbert represents an older measure now replaced by ampere-turns (At) in the SI system.
The grade of a magnet refers to performance and suitability for specific applications. Higher grades offer better magnetic fields and stability.
Litera: H
Used for measuring magnetic fields and detecting position. Hall sensors are widely utilized in electronics, such as ABS systems in vehicles.
Coercive force (Hc) represents a measure of a material's resistance to demagnetization. Expressed in SI units, higher Hc values indicate greater magnetic stability.
Hd denotes the force needed to magnetize a material and retain that state after the field is removed. Measured in various magnetic units.
A high field gradient magnet produces strong and rapidly changing magnetic fields. Applications include and scientific research requiring advanced field parameters.
Hm represents a key parameter in magnetic system design. It is critical for designing systems requiring high magnetic fields.
A homogeneous field is characterized by a lack of intensity variations over a given area. It is crucial for applications requiring precise magnetic fields.
A horseshoe magnet has enhancing the field strength in that region. Popular in education, metal detection.
Net effective magnetizing force (Hs) refers to an essential parameter for analyzing the magnetic properties of materials. Measured in oersteds (Oe) or kiloamperes per meter (kA/m).
The hysteresis graph, also called a permeameter, illustrates changes in magnetic induction (B) as a function of magnetizing force (H). It is used in and optimizing magnetic designs.
The hysteresis loop is a characteristic of magnetic materials. It provides information about the behavior of materials during magnetization cycles.
Hysteresis refers to a material's ability to retain partial magnetization after the external field is removed. Hysteresis loss is a transformation of energy into heat. Minimizing hysteresis loss improves the efficiency of magnetic systems.
Litera: I
Inner diameter (ID) refers to the distance between the inner surfaces of an object. It is an essential parameter in magnetic circuit design.
Magnetic induction (B) represents the amount of magnetic flux passing through a unit area. It is measured in Teslas (T) or Gauss (G). Essential for designing and analyzing magnetic systems.
Irreversible losses refer to a permanent reduction in a material's magnetization. They result in a decrease in magnetic properties and performance.
An isotropic material exhibits the same magnetic properties in all directions. used in applications requiring uniform magnetic behavior.
Litera: K
A keeper is an accessory preventing demagnetization of magnets. helps maintain the magnet's strength. Used primarily with Alnico magnets or older designs.
Kilogauss (kG) is a unit of magnetic field measurement. 1 kilogauss = 1000 Gauss. and industrial sectors requiring strong magnetic fields.
Litera: L
The load line represents a graphical relationship between remanent induction (Bd) and demagnetizing force (Hd). Helps evaluate magnetic material behavior and stability.
Lodestone is the first known natural magnet. possesses unique properties due to its magnetic domain alignment.
Litera: M
A magnet is a material attracting or repelling other magnetic materials. Can be natural, like lodestone, or artificial, such as neodymium.
A magnetic assembly is a system comprising various magnetic components. and magnetic levitation systems.
The magnetic axis is an imaginary line within a magnet where the magnetic field is most concentrated or intense. essential for analyzing the magnet's behavior and interactions with other magnetic components.
A magnetic circuit is analogous to an electrical circuit. key to designing magnetic devices.
Magnetic energy is the energy stored within a magnetic field. related to the strength of the magnetic field and the volume of space it occupies.
A magnetic field (B) is a fundamental electromagnetic phenomenon. Represented by magnetic flux lines.
Magnetic field strength (H) is the intensity of the magnetic field in a circuit. expressed in amperes per meter (A/m).
Magnetic flux is a measure of the total magnetic field in a given region. key in analyzing magnetic circuits and induction phenomena.
Magnetic flux density, denoted as B, is a measure of the strength or concentration of a magnetic field. It represents the amount of magnetic flux passing through a unit area.
The equation for it is:
B = Φ / A
Where:
B: Magnetic flux density (Tesla, Gauss)
Φ: Magnetic flux (Weber)
A: Surface area (m²)
If the area is 0.05 m² and the magnetic flux is 0.002 Weber, the resulting flux density is 0.04 Tesla.
A high B value indicates a stronger magnetic field, essential in industrial and medical applications.
The equation for it is:
B = Φ / A
Where:
B: Magnetic flux density (Tesla, Gauss)
Φ: Magnetic flux (Weber)
A: Surface area (m²)
If the area is 0.05 m² and the magnetic flux is 0.002 Weber, the resulting flux density is 0.04 Tesla.
A high B value indicates a stronger magnetic field, essential in industrial and medical applications.
The hysteresis loop illustrates the behavior of magnetic materials during cycles of magnetization and demagnetization. Materials with a narrower loop have lower energy losses.
expressed in units like teslas (T) in the SI system or gausses (G) in the CGS system. Magnetic flux density is a key parameter in designing magnetic systems.
A magnetic line of force, also known as a magnetic field line, is the path showing how magnetic poles would move within the field. The density of field lines reflects the strength of the field at various locations.
A magnetic path refers to the route taken by magnetic flux in a magnetic circuit or system. minimizes magnetic losses.
Magnetic permeability defines a material's ability to conduct magnetic flux. Materials with high permeability are more effective at concentrating magnetic fields.
Magnetic poles are regions where the magnetic field is strongest. Understanding pole interactions is crucial in designing magnetic systems.
Beyond saturation, further increases in the external field do not enhance magnetization. This parameter is vital when selecting materials for high-field applications.
Magnetization refers to the result of aligning atomic or molecular magnetic moments in a preferred orientation. It can be achieved by exposure to a magnetic field, electric current flow, or contact with other magnets.
Magnetization is the process of imparting magnetic properties to a material by aligning its magnetic domains. The ability to magnetize is crucial in designing permanent magnets and electromagnets.
A magnetization curve, also called a B-H curve or demagnetization curve, represents a graphical depiction of a material's magnetic properties. useful for selecting materials for specific applications.
Magnetized refers to the state of a material possessing a magnetic field or being magnetized. This state can be achieved through exposure to a magnetic field, contact with magnets, or electric current flow.
Magnetomotive force (mmf) is a measure of the difference in magnetic potential. Expressed in ampere-turns (At) or gilberts (Gb).
In magnetism, material refers to classified as ferromagnetic, paramagnetic, or diamagnetic. The magnetic behavior of a material depends on its atomic and molecular structure.
Maximum energy product, denoted as BHmax, is a measure of the maximum energy a magnet can deliver per unit volume.
It is calculated using the equation:
BHmax = B × H
Where:
B: Magnetic flux density (Tesla)
H: Magnetic field strength (A/m)
For a magnet with B = 1.2 T and H = 800 kA/m, BHmax equals 960 kJ/m³.
BHmax is a critical parameter for evaluating magnet performance, particularly in projects requiring maximum energy efficiency.
It is calculated using the equation:
BHmax = B × H
Where:
B: Magnetic flux density (Tesla)
H: Magnetic field strength (A/m)
For a magnet with B = 1.2 T and H = 800 kA/m, BHmax equals 960 kJ/m³.
BHmax is a critical parameter for evaluating magnet performance, particularly in projects requiring maximum energy efficiency.
Maximum operating temperature (Tmax) is a crucial parameter for applications in high-temperature environments. Ensures material stability and performance under specified conditions.
Maxwell is represents the amount of magnetic flux passing through a surface area of one square centimeter in a magnetic field of one gauss. This unit is used in the CGS system and corresponds to 10^−8 webers (Wb).
Mega Gauss Oersteds (MGOe) is a unit used to express the maximum energy product (BHmax) of permanent magnets. This unit helps assess the magnetic potential of magnets in complex magnetic circuits.
A monopole refers to a theoretical concept explored in physics, particularly particle physics. In reality, magnetic poles always occur in pairs, but monopoles are theorized in certain models.
Litera: N
N rating refers to the classification of neodymium magnets based on their magnetic properties and performance. These ratings assist users in selecting appropriate magnets for specific applications.
The north pole is the pole that, when freely suspended, points toward the Earth's geographic North Pole. The north pole of a magnet attracts the south pole of another magnet, generating magnetic attraction.
Litera: O
Oersted is a unit used to measure the intensity of the magnetic field (H). 1 oersted corresponds to the field that exerts a force of one dyne on a unit magnetic pole at a distance of one centimeter.
An open circuit refers to resulting in a break in the magnetic flux path. In this state, magnetic field lines cannot form a closed loop, leading to weakened magnetic fields.
Orientation refers to the alignment or positioning of a magnet, magnetic material, or magnetic component relative to a reference axis. Proper orientation is critical to achieving desired magnetic properties and optimizing magnetic systems.
Litera: P
Paramagnetic materials are substances that exhibit paramagnetism and are weakly attracted to magnetic fields. examples include aluminum, manganese, and oxygen.
Paramagnetism is occurs when materials develop a temporary magnetic moment in the direction of the field. The magnetism disappears once the external field is removed, due to the presence of unpaired electrons.
A permanent magnet is generates a persistent magnetic field without requiring an external magnetic field. It is made from materials with strong magnetic properties, such as iron, nickel, or cobalt alloys.
Permanent magnets generate a magnetic field without the need for external power. They are used in devices requiring a constant magnetic field, such as speakers, motors, and generators.
a characteristic that allows a material to support the formation of a magnetic field. High permeability enables efficient transmission of magnetic flux, critical for designing magnetic circuits.
Permeance, denoted by the symbol P, is a measure of a material's ability to conduct magnetic flux.
The mathematical formula for permeance is expressed as:
P = (μ × A) / l
Where:
μ: Magnetic permeability of the material (H/m)
A: Cross-sectional area of the magnetic path (m²)
l: Length of the magnetic path (m)
For instance, a material with a large cross-sectional area and short magnetic path exhibits high permeance, making it efficient in magnetic applications.
High permeability is crucial for enhancing the efficiency of magnetic systems.
The mathematical formula for permeance is expressed as:
P = (μ × A) / l
Where:
μ: Magnetic permeability of the material (H/m)
A: Cross-sectional area of the magnetic path (m²)
l: Length of the magnetic path (m)
For instance, a material with a large cross-sectional area and short magnetic path exhibits high permeance, making it efficient in magnetic applications.
High permeability is crucial for enhancing the efficiency of magnetic systems.
The permeance coefficient is the ratio of remanence (Br) to coercive force (Hd) in a magnetic material. This coefficient impacts magnetic stability and parameters such as the energy product (BHmax) in magnetic circuits.
Plating or coating refers to the process of applying a protective layer to the surface of neodymium magnets. Thanks to coatings, magnets can be used in harsh environmental conditions.
Polarity describes the orientation of the magnetic field in a neodymium magnet, which has two poles: north and south. plays a significant role in the design of magnet-based devices.
A magnetic pole refers to one of the two ends of a magnet where the magnetic field is strongest: north or south. define how magnets behave in external fields.
Pull force, sometimes referred to as gripping force, describes the force required to separate a magnet from a ferromagnetic surface. It can be approximately calculated using the formula:
F = B² × A / (2 × μ₀), where:
F - Pull force (in newtons, N).
B - Magnetic flux density at the magnet's surface (in teslas, T).
A - Contact area of the magnet with the material (in m²).
μ₀ - Permeability of free space (4π × 10⁻⁷ H/m).
Example: In the case where the magnetic flux density is 1.2 T, and the magnet's contact area is 0.005 m², the pull force is:
F = (1.2)² × 0.005 / (2 × 4π × 10⁻⁷) ≈ 572 N.
F = B² × A / (2 × μ₀), where:
F - Pull force (in newtons, N).
B - Magnetic flux density at the magnet's surface (in teslas, T).
A - Contact area of the magnet with the material (in m²).
μ₀ - Permeability of free space (4π × 10⁻⁷ H/m).
Example: In the case where the magnetic flux density is 1.2 T, and the magnet's contact area is 0.005 m², the pull force is:
F = (1.2)² × 0.005 / (2 × 4π × 10⁻⁷) ≈ 572 N.
Litera: R
Rare earth metals are a group of chemical elements, such as neodymium, which are key components of neodymium magnets. form the basis of innovative technological solutions.
They are made from rare earth elements like neodymium, dysprosium, and praseodymium. Their high efficiency makes them indispensable in numerous applications.
Relative permeability is a measure of how easily a material can be magnetized compared to a vacuum. Neodymium magnets exhibit high relative permeability, enabling efficient design of magnetic circuits.
the magnetic equivalent of electrical resistance in current circuits. is a significant parameter in evaluating the effectiveness of magnetic systems.
Magnetic resistance, denoted by the symbol R, measures a magnetic circuit's opposition to magnetic flux.
The mathematical formula for reluctance is:
R = l / (μ × A)
Where:
R: Magnetic resistance (1/H)
l: Length of the magnetic path (m)
μ: Magnetic permeability of the material (H/m)
A: Cross-sectional area of the magnetic path (m²)
For example, with l = 0.2 m, μ = 4π × 10⁻⁷ H/m, and A = 0.01 m², the reluctance is approximately 1.59 × 10⁶ 1/H.
Reluctance is analogous to electrical resistance in DC circuits, making it a key parameter in designing magnetic circuits.
The mathematical formula for reluctance is:
R = l / (μ × A)
Where:
R: Magnetic resistance (1/H)
l: Length of the magnetic path (m)
μ: Magnetic permeability of the material (H/m)
A: Cross-sectional area of the magnetic path (m²)
For example, with l = 0.2 m, μ = 4π × 10⁻⁷ H/m, and A = 0.01 m², the reluctance is approximately 1.59 × 10⁶ 1/H.
Reluctance is analogous to electrical resistance in DC circuits, making it a key parameter in designing magnetic circuits.
Remanence, often denoted as Bd, is a measure of the residual magnetism remaining in a neodymium magnet after it has been saturated and the external magnetic field is removed. Allows for assessing the long-term stability and suitability of magnets for various applications.
Repelling refers to the phenomenon where like poles of neodymium magnets (e.g., north to north) exert a force that pushes them apart. The repulsive force is proportional to the magnetic strength and distance between the magnets.
The return path in a magnetic circuit involving neodymium magnets refers to the route through which the magnetic flux travels to complete the magnetic circuit. Is a critical component in designing efficient magnetic circuits.
Litera: S
Shear force, denoted by the symbol Fs, refers to the force required to shift a magnet along the contact surface in a direction parallel to the contact plane.
Shear force can be calculated using the formula:
Fs = F × tan(θ)
Where:
F: Pull force (N)
θ: Angle of the contact surface (rad)
The greater the angle, the higher the force required to move the magnet.
Shear force is a crucial factor in designing magnetic systems, particularly where high mechanical stability is required.
Shear force can be calculated using the formula:
Fs = F × tan(θ)
Where:
F: Pull force (N)
θ: Angle of the contact surface (rad)
The greater the angle, the higher the force required to move the magnet.
Shear force is a crucial factor in designing magnetic systems, particularly where high mechanical stability is required.
It is the pole that, when freely suspended, points toward the Earth's geographic South Pole. Magnetic field lines flow from the north pole to the south pole, defining interaction properties.
Stacking refers to the practice of combining multiple neodymium magnets to create an assembly with increased overall magnetic strength. Such arrangements enable stronger magnetic interactions and improved performance in various applications, such as magnetic separators, holders, or sensors.
Litera: T
Tesla is a unit of measurement for magnetic flux density, describing the strength and intensity of a magnetic field. In practice, tesla is used to evaluate magnet performance and design precise magnetic systems.
Anisotropic magnets have a specific direction of magnetization, ensuring higher efficiency compared to isotropic magnets. Isotropic magnets are ideal for general applications due to their flexibility.
Litera: W
Weber is the unit of magnetic flux, representing the total number of magnetic field lines passing through a specific area. Useful in analyzing magnet effectiveness in applications like generators, motors, and energy storage systems.
The weight of a neodymium magnet is an essential parameter influencing its applications. It can be simply determined based on its density and volume using the formula:
m = ρ × V, where:
m - mass of the magnet (in grams or kilograms).
ρ - density of the magnet (typically 7.5 g/cm³).
V - volume of the magnet (in cm³ or m³).
Example: A magnet with a density of 7.5 g/cm³ and a volume of 10 cm³, the weight is:
m = 7.5 × 10 = 75 g.
Calculating the weight helps select the right magnet for specific applications.
m = ρ × V, where:
m - mass of the magnet (in grams or kilograms).
ρ - density of the magnet (typically 7.5 g/cm³).
V - volume of the magnet (in cm³ or m³).
Example: A magnet with a density of 7.5 g/cm³ and a volume of 10 cm³, the weight is:
m = 7.5 × 10 = 75 g.
Calculating the weight helps select the right magnet for specific applications.