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MHT CET 2021 (24 Sep, Shift 1) · Parallel AC Circuits

Parallel AC Circuits question from MHT CET 2021 (24 Sep, Shift 1)

Q7MHT CET 2021 · 24 SEP · SHIFT 1Easy

Parallel AC Circuits

Which graph shows the correct variation of r.m.s. current 'I' with frequency 'f' of a.c. in case of (LCR) parallel resonance circuit?

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Answer: (a)

In parallel resonance, impedance is maximum at $f_0$ , so current is minimum there.
Away from $f_0$ (very low or very high $f$ ), L or C draws large current.
The smooth dip-shaped curve is Q, so the answer is (a).

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