Question

A compass has wire wound over its face and around its back side. What type of instrument is this and what is it used for?

A.
It is a simple electrical meter that can measure the resistance in the wire.

B.
It is a simple voltmeter that can measure the number of electrons in the wire.

C.
It is a simple galvanometer that can detect current in the wire.

D.
It is a simple electromagnet that can detect the magnetic field in the wire.