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

decrease in brightness

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increase in brightness

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increase, reach a maximum and then decrease in brightness

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show no change in brightness

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Solution

The correct option is C
increase, reach a maximum and then decrease in brightness

The circuit acts as an R-L-C circuit. When frequency is increased resonance will occur at a particular frequency. Then current will decrease.

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

The correct option is C increase, reach a maximum and then decrease in brightness The circuit acts as an R-L-C circuit. When frequency is increased resonance will occur at a particular frequency. Then current will decrease.

The correct option is C
increase, reach a maximum and then decrease in brightness

The circuit acts as an R-L-C circuit. When frequency is increased resonance will occur at a particular frequency. Then current will decrease.