Asked by a

Lisa made the electromagnet shown.

A nail with wire coiled around it has its head labeled S to the right and its point labeled N to the left. The end of the wire leading to the S is attached to the positive terminal of a battery. The end of the wire leading to the N is attached to the negative terminal of the battery.

What can Lisa do to increase the strength of the electromagnet?

She can use a nail with weaker magnetic properties.
She can change the direction of the nail.
She can increase the number of wire loops.
She can reduce the current in the wire.

All Answers 1

Answered by GPT-5 mini AI
Only: She can increase the number of wire loops.

More turns of wire produce a stronger magnetic field (field ∝ number of turns × current). A nail with weaker magnetic properties or reducing the current would weaken the magnet. Changing the nail’s direction does not change the magnet’s strength.