Which variable does not increase the strength of an electromagne

Question

Increasing the distance between the coils

Adding batteries to the electromagnet

Increasing the thickness of the wire

Increasing the number of coils

Answer 1

The variable that does not increase the strength of an electromagnet is increasing the distance between the coils.

In fact, increasing the distance between the coils usually decreases the strength of the electromagnetic field produced by the coils, as the magnetic field weakens with distance. The other options—adding batteries, increasing the thickness of the wire, and increasing the number of coils—can all contribute to a stronger electromagnet.