The radius of a coil s changing at the rate of `10^-2` units in a normal magnetic field of `10^-3` units and the induced e.m.f. is `1muV`. Find the final radius of the coil.

An a.c. generator consists of a coil of 2,000 turns each of area 80 cm^2 and rotating at an angular speed of 200 r.p.m. in a uniform magnetic field of 4.8 xx 10^-2 T. Calculate the peak and r.m.s. value of e.m.f induced in the coil.

At which position of the rotating coil in the magnetic field, the induced e.m.f. is maximum?

A copper disc of radius 10 cm placed with its plane normal to a uniform magneic field completes 1,200 rotations per minute. If induced e.m.f. between the centre and edge of the disc in 6.284 m V, find the intensity of the magnetic field Take pi = 3.142

A circular coil of 25 turns and radius of 12 cm is placed in a uniform magnetic field of 0.5 T normal to the plane of coil. If the current in the coil is 5 A, then total torque experienced by the coil.

A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad s^-1 in a uniform horizontal magnetic field of magnitude 3.0xx10^-2 . Obtain themaximum and average emf induced in the coil. If the coil forms a closed loop of resistance 10 Omega , calculate the maximum value of current in the coil. Calculate the average power loss due to Joule heating. Where does this power come from?

A coil and a bar magnet move with the same velocity. What will be induced e.m.f. in the coil?

When current in a coil changes with time, how is the back e.m.f. induced in the coil related to it?

A coil of metallic wire is stationary in non-uniform magnetic field. What is the e.m.f induced in the coil?