In an electric motor, which of the following remains fixed and which rotates with the coil?

Commutator; Brush

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

Of what substance is the core of the coil of an electric motor made?

What is the role of the split ring in an electric motor?

Fill in the following blanks with suitable words:

(a) Fleming's Rule for the motor effect uses the ............... hand.

(b) A motor contains a kind of switch called a ............ which reverses the current every half ............ .