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Question

An electric bulb and a capacitor are connected in series with an $$AC$$ 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 $${{X}_{c}}\propto \dfrac{1}{f}$$ 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.

Physics
NCERT
Standard XII

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