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What is the torque acting on the bob of ...

What is the torque acting on the bob of mass m of a simple pendulum Of length l, when the string of the pendulum makes an angle `theta` with the vertical ? When is the torque (i) zero and (ii) maximum.

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`tau =rF =l.sintheta xx mg, tau_("min") = 0`, when `theta =0, tau_("max") = mgl` when `theta = 90^(@)`
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