MHT CET 2023 Physics question

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

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

Answer: (C)

Solution

The bulb acts as a resistance , so this is a series LCR circuit with impedance . At low frequency the capacitive reactance is large, so is large and the current is small. As increases, falls and $ω

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Question ID VK-094669