What is the other name of the split ring used in an electric motor?

For Fleming's left-hand rule, write down the three things that are 90° to each other, and next to each one write down the finger or thumb that represents it.

Name the device which is used to reverse the direction of current in the coil of a motor.

What is the function of a commutator in an electric motor?

Of what substance are the brushes of an electric motor made ?