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Q.

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

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a

Total impedance of the circuit is unchanged

b

Total impedance of the circuit increases

c

The bulb glows brighter

d

The bulb glows dimmer

answer is B.

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Detailed Solution

Xc=1CW
If  ω  increases    decreases
Since impedance of circuit decreases, the bulb glows brighter

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