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A Bulb is Connected in Series with a Variable Capacitor and an Ac Source as Shown. What Happens to the Brightness of the Bulb When the Key is Plugged in and Capacitance of the Capacitor is Gradually Reduced? - Physics

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A bulb is connected in series with a variable capacitor and an AC source as shown. What happens to the brightness of the bulb when the key is plugged in and capacitance of the capacitor is gradually reduced?

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Solution

The capacitance of the capacitor is gradually reduced. Therefore, the capacitive reactance  `X_c=1/(2pifC)` increases.

Therefore, essentially, the overall resistance of the circuit increases. This causes a reduction in the amount of current flowing through the circuit. Therefore, the brightness of the bulb reduces

Concept: Capacitors and Capacitance
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