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
B
decreses
C
remains unchanged
D
sometime incenses and something decreases

Solution

## The correct option is A increaseThe 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.PhysicsNCERTStandard XII

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