The armature of a simple ac generator has 20 circular loops of wire, each with a radius of 10 cm. It is rotated with a frequency of 60 Hz in a uniform magnetic field of 800 mT.
(a) What is the maximum emf induced in the loops?
(b) How often is this value attained?
(c) If the time period in part (b) were cut in half, what would be the new maximum emf value?