(i) A circular coil of 100 turns and radius 15cm is rotated at 1200r.p.m. about a diameter in a uniform magnetic field of 0.050T. Calculate the peak value of the induced emf.
(ii) Hence find the r.m.s. value of the emf.
(iii) If the rotation speed is doubled while all other parameters remain unchanged, by what factor will the r.m.s. emf change?