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A pendulum has time period T for small o...

A pendulum has time period T for small oscillations. An obstacle P is situated below the point of suspension O at a distance `(3l)/4`. The pendulum is released from rest. Throughout the motion, the moving string makes small angle with vertical. Time after which the pendulum returns back to its initial position is

A

T

B

`3T//4`

C

`3T//5`

D

`4T//5`

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The correct Answer is:
B
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