MCQ
Which of following can induce the maximum induced voltage?
- A$1$ amp $dc.$
- B$1$ amp $1 Hz.$
- ✓$1$ amp $100 Hz.$
- D$20$ amp $dc.$
✓
Answer
Correct option: 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 $90o$ 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 $\text{EMF}$ is maximum in case of $1$ amp $100 \ Hz$ supply source in the coil.
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