Question

hen would an electromagnet stop working?
A.
An electromagnet would stop working after 24 hours.
B.
An electromagnet would stop working when it cools below 45°F.
C.
An electromagnet would stop working when it gets sunlight.
D.
An electromagnet would stop working when the electric current is interrupted.

Answer 1

D. An electromagnet requires an electric current to produce a magnetic field — if the current is interrupted, the magnetic field (and thus the magnetism) stops.