Question

When current passes through the circuit a compass needle rests in which direction (with respect to the Earth)?

A

South-north

B

North-south

C

East-west

D

West-east

Medium

Solution

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Correct option is
A

South-north

The earth acts like a huge magnet. Thus in the absence of electric current a compass needle always comes to rest in Earths North-south direction. However, when current passes through the circuit the needle comes to rests in the direction opposite to the magnetic field of Earth i.e. South-North direction.

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