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Question 31155
JEE Physics · Hard

Simple Harmonic Motion: Forced Oscillations MCQ

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Forced OscillationsHardQuestion 31155

Question

Phase of forced oscillations relative to driving force:
  1. A
    Is always zero
  2. B
    Is 90° at resonance (for lightly damped)
    Correct
  3. C
    Is 180° at resonance
  4. D
    Is 45° at resonance

Correct answer

Is 90° at resonance (for lightly damped)

Explanation

At exact resonance, response lags force by 90°. Below resonance: lag < 90°. Above resonance: lag > 90° → approaches 180°.

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