In an electric motor, a commutator

a. is made out of dozens of wire loops wrapped around a ferromagnetic core.

b. repeatedly reverses the flow of current through the armature.

is a magnet.

d. is directly connected to the current source.

b on edg 2020

b. Repeatedly reverses the flow of current through the armature.

Explanation:

The electric motor is a device that converts the electrical energy into mechanical energy. The commutator is a device that repeatedly reverses the flow of current through the armature. It is a split ring that acts as the commutator. It connects the external circuit through a carbon brush and the armature of the motor. Another important component of an electric motor is an electromagnet or permanent magnet.