$A$ simple harmonic oscillator of angular frequency $\omega = 2 \, rad \, s^{-1}$ is acted upon by an external force $F = \sin(t) \, N$. If the oscillator is at rest in its equilibrium position at $t = 0$,its position at later times is proportional to

  • A
    $\sin(t) + \frac{1}{2} \cos(2t)$
  • B
    $\cos(t) - \frac{1}{2} \sin(2t)$
  • C
    $\sin(t) - \frac{1}{2} \sin(2t)$
  • D
    $\sin(t) + \frac{1}{2} \sin(2t)$

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Explain the behaviour of the oscillator when the driving frequency is close to the natural frequency in small damped oscillation and define resonance.

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

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