A small, closely wound coil has n turns, area A, and resistance r. The coil is initially in a uniform magnetic field that has magnitude B and a direction perpendicular to the coil.
a) Calculate the induced electromotive force (emf) in the coil.
b) Determine the direction of the induced current in the coil.
c) Find the time constant of the coil.
d) Calculate the power dissipated in the coil.