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A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It:

1. will become rigid showing no movement
2. will stay in any position
3. will stay in north-south direction only
4. will stay in east-west direction only

Correct answer: will become rigid showing no movement

Solution

At the geomagnetic pole, the horizontal component of Earth's magnetic field is zero, so the compass needle cannot align itself in any specific direction and becomes stationary.

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