A current-carrying conductor is placed perpendicularly in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor.

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 ............ .

State two ways to increase the force on a current-carrying conductor in a magnetic field.

Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.