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Network TheoryResonance

A series RLC circuit has R = 20 ohm, L = 0.2 H and C = 50 microfarad. Its resonant frequency is closest to?

  • A15.9 Hz
  • B50.3 Hz
  • C159 Hz
  • D503 Hz
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Correct Answer: B. 50.3 Hz
Explanation: f0 = 1/(2π√LC). Here LC = 0.2×50×10^-6 = 10^-5, so f0 ≈ 50.3 Hz.
Reference: Standard network theory: resonance
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