Magnetism and Matter Set 5

A very small magnet is placed in the magnetic meridian with its south pole pointing north. The null point is obtained away from the centre of the magnet. If the earth's magnetic field (horizontal component) at this point is , the magnetic moment of the magnet is

Relative permeability of iron is 5500, then it magnetic susceptibility will be

Two identical short bar magnets, each having magnetic moment of , are arranged such that their axial lines are perpendicular to each other and their centres be along the same straight line in a horizontal plane. If the distance between their centres is , the resultant magnetic induction at a point midway between them is

Magnetic moment of bar magnet is M. The work done to turn the magnet by of magnet in direction of magnetic field B will be

At a temperature of C, the susceptibility of a ferromagnetic material is found to be X. Its susceptibility at C is

If a magnetic dipole of dipole moment M rotated through an angle with respect to the direction of the field H, then the work done is

The radius of the coil of a tangent galvanometer which has 10 turns is 0.1 m. The current required to produce a deflection of is

When two magnetic moments are compared using equal distance method the deflections produced are and . If the length of magnets are in the ratio , the ratio of their pole strength is

Keeping dissimilar poles of two magnets of equal pole strength and length same side, their time period will be

A magnetic dipole is placed in two perpendicular magnetic fields and and is in equilibrium taking angle with . Then