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A smalll bob attached to a string of len...

A smalll bob attached to a string of length `l` is suspended from a rigid support and rotates with uniform speed along a circle in a horizontal plane. Let `theta` be the angle made by the string with the vertical, then the length of a simple pendulum having the same period is

A

`l//cos theta`

B

`l sin theta`

C

`l//sin theta`

D

`l cos theta`

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The correct Answer is:
D
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