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Question

An AC voltage source of variable angular frequency ω and fixed amplitude V0 is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased

A
the bulb glows dimmer
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B
the bulb glows brighter
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C
total impedance of the circuit is unchanged
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D
total impedance of the circuit increases
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Solution

The correct option is C the bulb glows brighter
Impedance Z=1(ωC)2+R2
As ω increases, Z decreases.
Hence, bulb will glow brighter.

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