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

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

AIPMTAIPMT 2012Magnetism and Matter

Solution:

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It will stay in any position as the horizontal component of earth's magnetic field becomes zero at the geomagnetic pole.