Question

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

What action will make the electromagnet weaker?

(1 point)

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.
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Answer 1

Correct answer: She can decrease the number of coils around the nail.

Fewer coils (turns) reduce the magnetic field strength. The other actions would increase the field (thicker wire or higher voltage increase current; more wraps increase turns).