The figure shows a graph of the output voltage versus time for an AC generator,

Question

The figure shows a graph of the output voltage versus time for an AC generator, and also the current versus time for an attached resistor.
(a) Assuming the generator consists of a single coil of many turns being rotated in a uniform magnetic field, how many times per second is the coil being rotated?
(b) If the coil is rectangular with sides 7.5 cm and 13 cm, and if the magnetic field strength is 14 mT, at least how many turns must the coil contain?
(c) What is the resistance of the circuit containing the generator and the resistor?
(d) What is the maximum possible flux through the generator coil as it is spinning?
(e) For the times shown on the graph, at which times is the flux through the coil a maximum?

Explanation / Answer

Full period is 0.04 seconds for the current/voltage. The answer is 1/0.04=25 times per second.

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