Question

a current - carrying wire with many loops is called
a magnetic field.
a wire coil.
a solenoid.
a bar magnet.

Explanation:

A magnetic field is the region around a magnet or current - carrying wire where magnetic forces act. A wire coil is a general term for a wire wound into loops. A bar magnet is a permanent magnet with two poles. A solenoid is specifically a current - carrying wire with many loops.

Answer:

C. a solenoid.