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Standard XII

Physics

RMS Value

An AC voltage...

Question

An AC voltage source of variable angular frequency $ω$ and fixed amplitude $V_{0}$ is connected in series with a capacitance $C$ and an electric bulb of resistance $R$ (inductance zero). When $ω$ is increased

Total impedance of the circuit is unchanged

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The bulb glows dimmer

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Total impedance of the circuit increases

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The bulb glows brighter

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Solution

The correct option is D The bulb glows brighter
As $ω$ is increased, impedance of circuit decreases.
$\Rightarrow$ Current increases.
$\Rightarrow$ Bulb glows brighter.

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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

The correct option is D The bulb glows brighterAs ω is increased, impedance of circuit decreases. ⇒ Current increases. ⇒ Bulb glows brighter.

An AC voltage source of variable angular frequency $ω$ and fixed amplitude $V_{0}$ is connected in series with a capacitance $C$ and an electric bulb of resistance $R$ (inductance zero). When $ω$ is increased

The correct option is D The bulb glows brighter
As $ω$ is increased, impedance of circuit decreases.
$\Rightarrow$ Current increases.
$\Rightarrow$ Bulb glows brighter.