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An AC voltage source of variable angular...

An AC voltage source of variable angular frequency `(omega)` and fixed amplitude `V_(0)` is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When `(omega)` is increased

A

The bulb glows dimmer

B

The bulb glows brighter

C

Total impendance of the circuits is unchanged

D

Total impendance of the circuit increases

Text Solution

Verified by Experts

The correct Answer is:
2
In `R -C` circuit, the impedance is
`Z = sqrt(R^(2) + (1)/(omega^(2) + C^(2)))`,
As `omega` increases, `Z` decreases.
Since, Power `alpha (1)/("impedance")`, therefore the bulb glows brighter.
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Knowledge Check

  • An alternating voltage source of variable angular frequency 'o' and fixed amplitude V is connected in series with a capacitance C and electric bulb of resistance R (inductance zero). When ' omega ' is increased:

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