The distance of two points on the axis of a magnet from its centre is `10 cm` and `20 cm` repectively. The ratio of magnatic intensity at these points is `12.5 : 1`. The length of the megnet will be

The distance of two points from the centre of loop on the axis is 0.05cm and 0.02cm and the ratio of the magnetic fields at these points is 8:1 respectively. Find the radius of the loop

The difference in potential of two points lying on the axis a distance of 50 cm and 100 cm respectivelym from its centre is

The intensities of magnetic field at teo points on the axis of bar magnet at distance of 10 cm and 20 cm from the middle point in the ratio 18 : 1 . Find the distance between the pole of the magnets.

The ratio of magnetic fields on the axial line of a long magnet at distance of 10cm and 20cm is 12.5.1. The length of the magnet is

The intensities of magnetic field at two points on the axis of a bar magnet at distances of 10 cm and 20 cm from the middle point are in the ratio 18:1. Find the distance between the poles of the magnet.

The magnetic flux at two points on the axis of a circular coil at distances 5 cm and 20 cm from the centre are in the ratio 8:1. Find the diameter of the coil.