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1.
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
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
2.
Relative permeability of iron is 5500, then it magnetic susceptibility will be
3.
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
, 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
4.
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
of magnet in direction of magnetic field B will be
5.
At a temperature of 
C, the susceptibility of a ferromagnetic material is found to be X. Its susceptibility at 
C is
C, the susceptibility of a ferromagnetic material is found to be X. Its susceptibility at C is