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.

Similar Questions

The angle of dip at a place is $60^{\circ}$. At this place,the total intensity of the Earth's magnetic field is $0.64 \text{ units}$. The horizontal intensity of the Earth's magnetic field at this place is . . . . . . $\text{units}$.

The magnetic field due to the Earth is closely equivalent to that due to:

Assertion : The true geographic north direction is found by using a compass needle.
Reason : The magnetic meridian of the earth is along the axis of rotation of the earth.

Explain the magnetic field of the Earth and give the order of magnitude of the Earth's magnetic field.

$A$ magnetic needle is free to rotate in a vertical plane which makes an angle of $60^{\circ}$ with the magnetic meridian. If the needle stays in a direction making an angle of $\tan^{-1}\left(\frac{2}{\sqrt{3}}\right)$ with the horizontal,the true dip value at that place is: (in $^{\circ}$)

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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.