Answer:

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

Using Fleming’s left-hand rule, the forefinger (or index finger) represents the magnetic field, the middle finger (or middle finger) represents the current, and the thumb represents the force.

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

In an electric motor, a split-ring or commutator has two conducting arcs separated by an insulator. It permits the motor’s coil to rotate by reversing the current 180°. The coil continues to rotate as long as current from the battery is delivered through it.