Question

uan makes an adjustment to an electromagnet that causes the electromagnet to lose some of its strength. What did Juan most likely do?

He reduced the number of loops in the wire.
He increased the number of loops in the wire.
He reduced the length of the wire.
He increased the length of the wire.

Answer 1

He reduced the number of loops in the wire.

Fewer turns means fewer ampere-turns (N·I), so the magnetic field produced by the electromagnet becomes weaker.