Consider a coil rotating at a speed of N rpm in the field of P poles. As the coil moves past successive north the south poles, one complete cycle is generated. What is the frequency of the generated voltage?
1. \(\frac{{PN}}{{60}}\)
2. \(\frac{{PN}}{{120}}\)
3. \(\frac{{120\;P}}{N}\)
4. \(\frac{{120\;f}}{P}\)