# How does current affect the strength of an electromagnet?

##### 1 Answer
Jun 3, 2015

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.