A) \[75{}^\circ \]
B) \[60{}^\circ \]
C) \[45{}^\circ \]
D) \[30{}^\circ \]
Correct Answer: D
Solution :
Key Idea: Dip needle becomes vertical at the poles and horizontal at the equator. A dip circle is used to measure the angle between the direction of the earth's magnetic field and the horizontal at any point on the earth's surface. At earth's magnetic poles, the magnetic field of earth is vertical (V) and at the equator, the field is horizontal (H), hence we have \[\tan \delta =\frac{V}{H}\] Given, \[H=\sqrt{3}V\] \[\therefore \] \[\tan \,\,\delta \,=\,\frac{V}{V\sqrt{3}}=\frac{1}{\sqrt{3}}\] \[\delta ={{\tan }^{-1}}\left( \frac{1}{\sqrt{3}} \right)={{30}^{o}}\]You need to login to perform this action.
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