Question

If a magnet is suspended with a silk thread such that it is free to rotate in a horizontal plane, it sets itself always pointing in the :
(a) geographic east-west direction
(b) magnetic east-west direction
(c) geographic north-south direction
(d) None of the above

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Answer

(c) geographic north-south direction

Reason — If a magnet is suspended with a silk thread such that it is free to rotate in a horizontal plane, it will align itself in the geographic north-south direction. This alignment is due to the Earth’s magnetic field, which exerts a force on the magnet and causes it to align along the magnetic field lines.

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