NCERT Solutions for Chapter: Magnetism and Matter, Exercise 1: MCQ

$S$ is the surface of a lump of magnetic material.

The primary origin$\left(s\right)$ of magnetism lies in

A long solenoid has $1000$ turns per metre and carries a current of $1 \mathrm{A}$. It has a soft iron core of ${\mu }_r=1000$. The core is heated beyond the Curie temperature, $T_c$.

Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due to

Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator