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JIPMER2010PhysicsElectromagnetic Induction

The impedance of a circuit, when a resistance R and an inductor of inductance L are connected in series in an AC circuit of frequency f , is

Options

  1. AR+2 ^2 f^2 L^2
  2. BR+4 ^2 f^2 L^2
  3. CR^2+4 ^2 f^2 L^2
  4. DR^2+2 ^2 f^2 L^2

Correct answer

C. R^2+4 ^2 f^2 L^2

Step-by-step solution

In L-R circuit, Impedance Z= R^2+X_L^2 Here, X_L= L=2 f L Z= R^2+4 ^2 f^2 L^2

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