Embibe Experts Solutions for Chapter: Matter and Magnetism, Exercise 2: Exercise-2

The magnetic moment of a short magnet is $8 {\mathrm{Am}}^2$. The magnetic induction at a point $20 \mathrm{cm}$ away from its mid point on $\left(\mathrm{i}\right)$ axial point $\left(\mathrm{ii}\right)$ equatorial point respectively, will be :-

A magnetic needle lying parallel to a magnetic field requires $W$ unit(s) of work to turn it through $60°$. The torque needed to maintain the needle in this position will be,