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A circuit contains a light bulb and a capacitor (RC circuit) in series connected to an...

A circuit contains a light bulb and a capacitor (RC circuit) in series connected to an AC power supply. How should you choose the AC frequency such that the light glow the brightest? Why?

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Answer #1

For higher frequencies the reactance of the capacitance is small so the current is large. Voltage drop across the bulb increases and hence power dissipated by the bulb will be more. As a result it will be more brighter.

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