Question

How does current affect the strength of an electromagnet?

Answer 1

The magnitude of current is proportional to the strength of the magnetic field it produces. This fact is well illustrated by the Biot-Savart law or the Ampere's circuital theorem.

This naturally implies that the current is directly proportional to the strength of the electromagnet.

For example, if we are using a solenoid as an electromagnet, we are familiar with the expression,

`B = mu""_0nI` , where `B` is the magnetic field strength and `I` is the electric current.