A small bob attached to a string of length \( \ell \) is suspended ...

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A small bob attached to a string of length \( \ell \) is suspended from a rigid support and rotates with
\( \mathrm{P} \) uniform speed along a circle in a horizontal

W 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
(1) \( \frac{\ell}{\cos \theta} \)
(2) \( \ell \sin \theta \)
(3) \( \frac{\ell}{\sin \theta} \)
(4) \( \ell \cos \theta \)
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