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An AC voltage source of variable angular frequency ω and fixed amplitude V₀ is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased

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The bulb glows dimmer

The bulb glows brighter

Total impedance of the circuit is unchanged

Total impedance of the circuit increases

answer is B.

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Detailed Solution

Impedance of the circuit, $Z = \sqrt{{(\frac{1}{ωC})}^{2} + R^{2}}$ .

$\Rightarrow$ As $ω$ increases, $Z$ decreases and current amplitude $I_{0} = \frac{V_{0}}{Z}$ increases.

$∴$ The bulb glows brighter.

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