Question

The angles of dip at the poles and the equator respectively are.

• A. ${30}^o,{60}^o$
• B. $0^o,{90}^o$
• C. ${45}^o,{90}^o$
• D. ${90}^o,0^o$

Answer 1

Answer: (D)

${90}^o,0^o$

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 R makes with a horizontal line in magnetic meridian,
At poles B$=B_V$ and $B_V=B\sin \delta$
$\therefore \sin \delta =1\Rightarrow \delta ={90}^o$
At equator $B=B_H$ and $B_H=B\cos \delta$
$\therefore \cos \delta =1\Rightarrow \delta =0^o$.