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CUET · PHYSICS · PYQ PAPER 2023

In a series LCR circuit, the voltage across \(R\) is \(200 V, C=5 \mu F\), and \(R=2 k \Omega\). The resonant frequency \(\omega\) is \(1 0 0 ~ r a d / s\). At resonance, the voltage across \(L\) is:

  1. A 250 V
  2. B 200 V
  3. C 500 V
  4. D 100 V
Verified Solution

Answer & Solution

Correct Answer

(B) 200 V

Step-by-step Solution

Detailed explanation

\(I = V_R / R\) \(I = 200 V / (2 \times 10^3 \Omega) = 0.1 A\) \(X_C = 1 / (\omega C)\) \(X_C = 1 / (100 \text{ rad/s} \times 5 \times 10^{-6} F) = 2000 \Omega\) \(X_L = X_C = 2000 \Omega\) \(V_L = I X_L\) \(V_L = 0.1 A \times 2000 \Omega = 200 V\)
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