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Explain briefly, with the help of a labelled diagram,the basic principle of the working of an a.c. generatorIn an a.c. generator, coil of N turns and area A isrotated at v revolutions per second in a uniformmagnetic field B Derive an expression for theinstantaneous value of the emf induced in coil.Why is the emf maximum when the plane of thearmature is parallel to the magnetic field ? What isthe source of energy generation in this device ?[CBSE OD 08, 11, 17 F09 D 17)

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