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MHT CET 2023 (9 May, Shift 1) · Resonance, Bandwidth & Q Factor

Resonance, Bandwidth & Q Factor question from MHT CET 2023 (9 May, Shift 1)

Q63MHT CET 2023 · 9 MAY · SHIFT 1Easy

Resonance, Bandwidth & Q Factor

A capacitor, an inductor and an electric bulb are connected in series to an a.c. supply of variable frequency. As the frequency of the supply is increased gradually, then the electric bulb is found to

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Answer: (c)

Brightness depends on $I_{rms} = \frac{V}{Z}$ (bulb acts as $R$ ).
$Z$ first falls, is minimum ( $Z = R$ ) at resonance, then rises as frequency increases.
So current, and brightness, increases, peaks at resonance, then decreases.
So the answer is (c).

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