Write the equation of magnetic field on the axis of current carrying finite solenoid.
The ultimate individual unit of magnetism in any magnet is called
In the case of bar magnet, lines of magnetic induction
The distance of two points on the axis of a magnet from its centre is $10 \,cm$ and $20 \,cm$ respectively. The ratio of magnetic intensity at these points is $12.5 : 1. $ The length of the magnet will be......$cm$
Write difference between electrostatic and magnetics :
Force between two unit pole strength placed at a distance of one metre is