A coil of copper wire of \(N\) turns is kept rotating between the poles of a permanent magnet such that the magnetic flux linking the coil changes continuously. Which of the following statements is TRUE?
A. An e.m.f. is induced in the coil such that when the change of flux is positive, the e.m.f. is positive, and when the change of flux is negative, the e.m.f. is negative B. An e.m.f. is induced in the coil whose magnitude is inversely proportional to both the number of turns in the coil and the rate of change of magnetic flux C. An e.m.f. is set up in the permanent magnet which reduces the flux in the coil to zero D. A current flows in the coil and an e.m.f. is set up proportional to
