Elle 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, Elle can decrease the number of coils around the nail. Reducing the number of coils will decrease the magnetic field strength, making the electromagnet less effective at attracting objects.