Question

At a place, the horizontal and vertical components of the Earth's magnetic field are equal. Then find the angle of dip at that place:

• A. $30^{\circ }$
• B. $75^{\circ }$
• C. $60^{\circ }$
• D. $45^{\circ }$

Answer 1

Answer: (D)

Dip angle in magnetic meridian is defined as $\delta ={\tan }^{-1}\left(\frac{B_V}{B_H}\right)$ It is given that $B_H=B_v$
$\Rightarrow \delta ={\tan }^{-1}\left(\frac{B_V}{B_V}\right)={\tan }^{-1}(1)=45^{\circ }$
$\therefore \delta =45^{\circ }$