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NEET2005PhysicsAlternating CurrentActual

In a circuit L , C and R are connected in series with an alternating voltage source of frequency f . The current leads the voltage by 45^ . The value of C is:

Options

  1. A1 f(2 f(L-R)
  2. B1 2 f(2 f L-R)
  3. C1 f(2 f L+R)
  4. D1 2 f(2 f L+R)

Correct answer

D. 1 2 f(2 f L+R)

Step-by-step solution

aligned & = X_C-X_L R ( 4 ) & = 1 C - L R R & = 1 C - L (R+2 f L) & = 2 2 f C C & = 1 2 f(R+2 f L) aligned

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