A coil ABCD mounted on an axle is placed between the poles N and S of

1.	A coil ABCD mounted on an axle is placed between the poles N and S of permanent magnet as shown in figure.a) In which direction will the coil begin to rotate when the current is passed through the coil in direction ABCD by connecting a battery at the ends A and D of the coil. b) Why is commutator necessary for continuous rotation of the coil?
Answer» a) Anti-clockwise direction. b) Commutator is needed to change the direction of current in the coil after each half rotation of coil.

A coil ABCD mounted on an axle is placed between the poles N and S of permanent magnet as shown in figure.a) In which direction will the coil begin to rotate when the current is passed through the coil in direction ABCD by connecting a battery at the ends A and D of the coil. b) Why is commutator necessary for continuous rotation of the coil?

Answer»

a) Anti-clockwise direction.

b) Commutator is needed to change the direction of current in the coil after each half rotation of coil.

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