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COMEDK20269 May 2026Evening ShiftPhysicsAlternating CurrentActual

An electronic device operates at 2 MHz. The oscillating circuit has an inductance 20 10⁻⁵ H. What is the capacitive reactance of the resonant circuit?

Options

  1. A5024
  2. B251.2
  3. C2512
  4. D1256

Correct answer

C. 2512

Step-by-step solution

At resonance, the capacitive reactance is equal to the inductive reactance. X_C = X_L = L = 2 f L Given f = 2 10^6 Hz and L = 20 10⁻⁵ H. X_C = 2 3.14 2 10^6 20 10⁻⁵ X_C = 800 3.14 = 2512 Answer: 2512

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