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Capacitive Reactance

An electric b...

Question

An electric bulb and a capacitor are connected in series with an $A C$ source. On increasing the frequency of the source, the brightness of the bulb:

A

increase

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B

decreses

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C

remains unchanged

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D

sometime incenses and something decreases

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Solution

The correct option is A increase
The capacitive reactance and frequency are related as $X_{c} \propto \frac{1}{f}$ where f is frequency
On increasing the frequency the capacitive reactance decreases. If reactance decreases the the bulb glows with more brightness and more current flows.

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