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AP EAMCET202021 Sep 2020Evening ShiftPhysicsOscillationsActual

Four pendulums (A, B, C ) and (D ) are hanged from the same elastic support as shown in the figure. (A ) and (C ) are of the same length while (B ) is smaller than (A, C ) while (D ) is longer than (A ). If (A ) is given displacement, then at steady state

Options

  1. A(D ) will vibrate with max amplitude
  2. B(C ) will vibrate with max amplitude
  3. CB will vibrate with max amplitude
  4. DAll four will oscillate with equal amplitude

Correct answer

B. (C ) will vibrate with max amplitude

Step-by-step solution

According to given diagram, length of pendulum (A ) and (C ) is same. Hence, time period ( (T=2 l g ) ) of pendulum (A ) and (C ) is also same. Therefore, they have same frequency of oscillation. Due to this, resonance takes place and the pendulum (C ) will vibrate with maximum amplitude.

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