A p ermanent magnet is the shape of a thin cylinder of length 10 cm has `M=10^6 Am`. Calculate the magnetisation current `I_M`.

A bar magnet of length 0.1 m has a pole strength of 50 A m. Calculate the magnetic field at distance of 0.2 m from tis centre on its axial line

A bar magnet of length 0.1 m has a pole strength of 50 A m. Calculate the magnetic field at distance of 0.2 m from tis centre on its equitorial line.

An object is placed at 0.06 m from a convex lens of focal length 0.10 m.Calculate the position and nature of the image.

A magnet weighs 75 g and its magnetic moment is 2xx10^-4 A m^2 . If the density of the material of the magnet is 7.5 xx 10^3 kg m^-3 , calculate the intensity of magnetisation.

A bar magnet of length 8 cm and having a pole strengh of 1.0 A m is placed vertically on a horizontal table with its south pole on the table. A neutral point is found on the table at a distance of 6.0 cm north of the magnet. Calculate the earth's horizontal magnetic field.

A potential difference of 6 V is applied across a conductor of length 0.12 m. Calculate the drift velcoity of electrons, if the electron mobility is 5.6 xx 10^-6 m^2V^-1s^-1 .

A Rowland ring has 10^3 turns per uit length. On passing a current of 2 A, magnetic induction is measured to be 1.5 Wb m^-2 . Calculate magnetisation.

A bar magnet has a magnetic moment of 10 A m^2 . If its magnetic length is 5 cm, calculate its pole strength.