Assertion :A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction. Reason: The earth has only horizontal component of its magnetic field at the north pole.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
When a compass needle is placed on magnetic north pole of earth then the needle which is also north pole of magnet inside gets deflected to south pole which is geographic north.
At poles, lines are only vertical.

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