Ellie made an electromagnet with wire, a nail, and a 2.5-volt battery. The electromagnet attracted a paper clip from 2 inches away.

Question

What action will make the electromagnet weaker?

She can use a thicker piece of wire.

She can use a higher voltage battery.

She can wrap the wire more times around the nail.

She can decrease the number of coils around the nail.

Answer 1

To make the electromagnet weaker, Ellie should decrease the number of coils around the nail. This would reduce the strength of the magnetic field generated by the electromagnet.

So, the correct action to weaken the electromagnet is:

She can decrease the number of coils around the nail.