Assertion : The true geographic north directi | vedclass

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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 declina

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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

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$A$ 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 : 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.