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JEE Advanced2010PhysicsAlternating CurrentActual

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 is increased

Options

  1. Athe bulb glows dimmer
  2. Bthe bulb glows brighter
  3. Ctotal impedance of the circuit is unchanged
  4. Dtotal impedance of the circuit increases

Correct answer

B. the bulb glows brighter

Step-by-step solution

Z= R^2+X_C^2 : I_ rms = V_ rms Z : P=I_ rms ^2 R where, X_C= 1 C As is increased, X_C will decrease or Z will decrease. Hence I_ mms or P will increase. Therefore, bulb glows brighter. Hence the correct option is (b).

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