(a) Name three elements required to specify the earth's magnetic field at a given place. Draw a labelled diagram to define these elements . Explain briefly how these elements are determined to find out the magnetic field at a given place on the surface of earth. (b) A short bar magnet of magnetic moment m = `0.32 J T^(-1)` is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field , which orientation would correspond to its (a) stable and (b) unstable equilibrium ? What is the potential energy of the magnet in each case ?
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