Assertion: If a compass needle is kept at the | vedclass

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(A) At the magnetic poles of the Earth,the horizontal component of the Earth's magnetic field $(H)$ is zero.Since a standard compass needle is designe

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) At the magnetic poles of the Earth,the horizontal component of the Earth's magnetic field $(H)$ is zero.Since a standard compass needle is designed to rotate only in a horizontal plane,it experiences no torque from the horizontal component of the magnetic field.Therefore,the compass needle can remain in any direction.This confirms the Assertion is correct.$A$ dip needle is free to rotate in a vertical plane.At the magnetic poles,the magnetic field lines are perpendicular to the Earth's surface,meaning the angle of dip is $90^o$.Consequently,the dip needle aligns itself vertically.This confirms the Reason is correct.Since the behavior of the compass needle is a direct consequence of the magnetic field being purely vertical (which is also why the dip needle is vertical),the Reason correctly explains the Assertion.

Assertion: If a compass needle is kept at the magnetic north pole of the Earth,the compass needle may stay in any direction.
Reason: $A$ dip needle will stay vertical at the north pole of the Earth.

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Assertion: If a compass needle is kept at the magnetic north pole of the Earth,the compass needle may stay in any direction.Reason: $A$ dip needle will stay vertical at the north pole of the Earth.