A) \[30{}^\circ ,\text{ }60{}^\circ \]
B) \[0{}^\circ ,\text{ }90{}^\circ \]
C) \[45{}^\circ ,\text{ }90{}^\circ \]
D) \[90{}^\circ ,\text{ }0{}^\circ \]
Correct Answer: D
Solution :
Since angle of dip at a place is defined as the angle \[\delta \], which is the direction of total intensity of earth's magnetic field B makes with a horizontal line in magnetic meridian, At poles \[B={{B}_{V}}\]and \[{{B}_{V}}=B\,\sin \,\delta \] \[\therefore \,\,\,\,\sin \,\,\delta =1\,\Rightarrow \delta =90{}^\circ \] At equator \[B={{B}_{H}}\]and \[{{B}_{H}}=B\,\cos \delta \] \[\therefore \,\,\cos \,\delta =1\,\,\,\Rightarrow \delta =0{}^\circ \].
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