Any rigid body suspended from a fixed support constitutes a physical pendulum. Consider the situation when the body is displaced through a small angle Torque on the body about O is given by
... (i)
where = distance between point of suspension and centre of mass of the body.
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If I be the M.I. of the body about O, then, ... (ii)
From (i) and (ii), we get,  are oppositely directed.
 since is very small.
Comparing with the equation , we get
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