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Question

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


A
increase in brightness
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B
decrease in brightness
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C
increase, reach a maximum and then decrease in brightness
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D
show no change in brightness
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Solution

The correct option is D increase, reach a maximum and then decrease in brightness
I=V  R2+ωL1ωC2
it is clear from te expression that as ω increases, (ωL1ωC)2 decreases first then it starts increasing.
So the brightness increases first and then decreases.

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