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In case of a forced vibration, the resonance wave becomes very sharp when the

1. quality factor is small
2. damping force is small
3. restoring force is small
4. applied periodic force is small

Correct answer: damping force is small

Solution

In forced vibrations, resonance becomes sharp when the damping force is small because less energy is dissipated, allowing the system to oscillate more prominently at the natural frequency.

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