Question

Which of following can induce the maximum induced voltage?

• A. 1 amp dc.
• B. 1 amp 1 Hz.
• C. 1 amp 100 Hz.
• D. 20 amp dc.

Answer 1

The correct option is C 1 amp 100 Hz.

If we apply a high-frequency supply of the same peak voltage to the coil, the current still is being delayed by 90${}^o$ but the time it requires to reach its maximum value has been reduced due to the increase in frequency. Because the frequency is inversely proportional to time (T). Hence, the rate of change of the flux within the coil has also increased due to the increase in frequency. Hence, the induced EMF is maximum in case of 1 amp 100 Hz supply source in the coil.