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There are four main factors that affect the magnetic strength of the electromagnet.
1. The number of coils wound on the core
2. The strength of the current in the coil
3. The distance between the coil and the core
4. The size and shape of the core.

We need to understand how the magnetism of the electromagnet is generated. The magnetic field of an energized solenoid should be determined by the current and the number of solenoids. The biot-savart law should be b=u0*n*i, b is the magnetic induction, u0 is a constant, n is the number of solenoid turns, and i is the current in the conductor.

In order to demagnetize the electromagnet immediately after power off, we often use soft iron or silicon steel material with faster demagnetization speed. This electromagnet has magnetism when it is energized, and the magnetism disappears after power off. Electromagnets are widely used in our daily life. Thanks to its invention, the power of the generator has been greatly increased.