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} $
$\therefore \delta=45^{\circ}$