Assertion : The true geographic north directi | vedclass

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Question

(D) The true geographic north-south direction is inclined at an angle with the magnetic north-south direction. This angle is known as magnetic declina

Vedclass · Accepted Answer

If both the Assertion and Reason are incorrect.

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(D) The true geographic north-south direction is inclined at an angle with the magnetic north-south direction. This angle is known as magnetic declination.$A$ compass needle aligns itself with the magnetic north-south direction,not the geographic north-south direction.The magnetic meridian passes through the magnetic north and south poles,whereas the geographic meridian passes through the geographic north and south poles (the axis of rotation).Since the magnetic axis and the geographic axis are not coincident,both the Assertion and the Reason are incorrect.

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.

Similar Questions

$A$ dip needle lies initially in the magnetic meridian when it shows an angle of dip $\theta$ at a place. The dip circle is rotated through an angle $x$ in the horizontal plane and then it shows an angle of dip $\theta'$. Then $\frac{\tan \theta'}{\tan \theta}$ is

The angle of dip is the angle

If $\theta_1$ and $\theta_2$ are the apparent angles of dip observed in two vertical planes at right angles to each other,then the true angle of dip $\theta$ is given by:

At which place does the Earth's magnetism become horizontal?

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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.