A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of 50ms-1 in a uniform horizontal magnetic field of magnitude 3.0 x 10-2 T. Obtain the maximum and the average EMF induced in the coil. If the coil forms a closed loop of resistance 10 W, how much power is dissipated as heat? What is the source of this power?
Maximum EMF
= 20 x 3 x 10-2 x 3.14 x (8 x 10-2)2 x 50 volt = 0.6 volt
Maximum current,
Power loss
The source of this power is the external agent (motor) which helps the coil rotating against the torque of the induced current.
