The graph in the figure shows the emf produced by a generator as a function of time t. The coil for the generator has an area of A = 0.15 m2 and consists of N = 10 turns. The coil rotates in a field of magnitude 0.27 T.
Concepts:
(i) Can the period of the rotating coil be determined from the graph?
(ii) The emf produced by a generator depends on its angular frequency. How is the angular frequency of the coil related to its period?
(iii) Starting at t = 0 s, how much time is required for the generator to produce its peak emf? Express the answer in terms of the period T of the motion (e.g., t = (0.1) T).
(iv) How often does the polarity of the emf change in one cycle?
Calculations:
(a) Determine the period of the motion.
(b) What is the angular frequency of the rotating coil?
(c) Find the value of the emf when t = 1/4T, where T denotes the period of the coil motion.
(d) What is the emf when t = 0.025 s?

C3 0.060 t (s)