question_answer 6)

A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of 500 rad in a uniform horizontal magnetic field of magnitude . Obtain the maximum and average emf induced in the coil. If the coil forms a closed loop of resistance 10 , calculate the maximum value of current in the coil. Calculate the average power loss due to Joule beating. Where does this power come from?  

Answer:

(i) Using                 When or                 We get                  Then                                                 (ii) for full cycle = zero                 (iii)                 (iv) Power loss                                                 (v) Source of power loss is the external rotor which provides the necessary torque.