Magnetism and Matter question for JEE Main (JEE Main 2021 (22 Jul, Shift 1)), with solution

Answer: (B) True dip is less than apparent dip.

In a vertical plane at angle $\theta$ to the magnetic meridian, $\tan\delta' = \dfrac{\tan\delta}{\cos\theta} \ge \tan\delta$.

So the true dip $\delta$ is less than (at most equal to) the apparent dip $\delta'$; they are equal only in the magnetic meridian.

Solution by Sreeraj P, M.Sc Physics