What is gauss magnetic induction exactly?

Why do different magnets have different gauss values?

Not every manufacturer or seller provides the Gauss value for their products. However, when they do, it is crucial to understand that the same Gauss value can be used to describe two different aspects of the magnet. For example, on our website, different Gauss values are provided for:
Br - Magnetic remanence, which is the density of magnetic flux in a closed circuit.
B - Magnetic induction, which is the density of magnetic flux in an open circuit.
Although both values describe the quantity of magnetic lines per cm², they describe different scenarios and conditions.

What is magnetic remanence, and why is it important?

Magnetic remanence, often denoted by the symbol Br, describes the magnetism that remains in the magnet after the removal of an external magnetizing force. It is essentially the 'memory' of the magnet, allowing it to retain some of its magnetic strength even after exposure to a strong magnetic field has ceased.

And how does remanence differ from magnetic induction?

Magnetic induction (B) refers to the density of magnetic flux on the surface of the magnet in an open space. It is a value that can change depending on the distance from the magnet. For example, a disc with dimensions MW 10x2 / N38 - neodymium magnet may exhibit magnetic induction on the surface of approximately 2300 gauss, but at a distance of 10 mm from the magnet's surface, this value drops to 188 gauss.

Size vs gauss value - is there a relationship?

Many people may think that a larger magnet will always have a higher Gauss value. However, this is not true. The size and strength of a magnet are not always correlated with the Gauss value. A large magnet with dimensions MPL 100x40x20 / N38 - neodymium magnet may actually have a lower density of magnetic flux than a smaller one with dimensions MPL 3x3x1 / N38 - neodymium magnet.

How is magnetic flux density exactly determined?

There are two main ways to determine magnetic flux density. The first is the experimental method, where a gaussmeter or teslameter is used. The second is the theoretical method, based on mathematical formulas or specialized simulation software.

In which situations is the Gauss value crucial?

Although most people need magnets for simple applications, such as attaching a note to a refrigerator, in some situations the precision of magnetic induction value is crucial. If you are involved in research, engineering, or any application that requires the accuracy of a magnet's operation, the Gauss value and its precise understanding are essential. However, remember when choosing a magnet to check its strength, check the Gauss ;)