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Standard XII
Physics
Magnetic Field Due to a Straight Long Wire
Question

When current passes through the circuit a compass needle rests in which direction (with respect to the Earth)?
  1. South-north
  2. North-south
  3. East-west
  4. West-east

A
East-west
B
South-north
C
West-east
D
North-south
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Solution
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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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