Magnetism And Matter

The variation of the intensity of magnetisation (I) with respect to the magnetising field (H) in a diamagnetic substance is described by the graph

Figure shows a straight wire length carrying current . The magnitude of magnetic field produced by the current at point is.

If the work done in turning a magnet of magnetic moment by an angle of 90 from the magnetic meridian is times the corresponding work done to turn it through an angle of 60 , then the value of is