IITJEE 2009 question otherway round !

2 circular coils A and B with different number of turns are placed at some separation (say d) apart in the same plane. They carry currents I1 and I2 respectively which are maintained. The coefficient of mutual induction for this pair of coils is M. Now coil B is rotated about its vertical diametrical axis by 900. Calculate the work done in the process.

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