Define pole strength of magnet. and Write the unit of pole strength of magnet
 

The mid points of two small magnetic dipoles of length $d$ in end-on positions, are separated by a distance $x, (x > > d)$. The force between them is proportional to $x^{-n}$ where $n$ is

The earth’s magnetic field at the equator is approximately $0.4 \;G$. Estimate the earth’s dipole moment.

The magnetic field at a point $x $ on the axis of a small bar magnet is equal to the field at a point $  y  $ on the equator of the same magnet. The ratio of the distances of $x$ and $y$  from the centre of the magnet is

A bar magnet of length $6\,cm$ has a magnetic moment of $4\,J\,T^{-1}$. Find the strength of magnetic field at a distance of $200\,cm$ from the centre of the magnet along its equatorial line.