Write a brief history of magnet.
The magnetic potential at a point on the axial line of a bar magnet of dipole moment $M$ is $V$. What is the magnetic potential due to a bar magnet of dipole moment $\frac{M}{4}$ at the same point
A current loop placed in a magnetic field behaves like a
A magnet is placed in iron powder and then taken out, then maximum iron powder is at
A bar magnet is placed north-south with its north pole due north. The points of zero magnetic field will be in which direction from the centre of the magnet