The period of oscillation of a bob suspended by a string of length l is . This expression is valid only for

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A light bob and no friction

Small amplitude of oscillation and a small bob

A bob of low density

A bob which is not ferromagnetic and large amplitude

answer is B.

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Detailed Solution

Restoring torque = If θ is small , preferably less than 40, , we can writeThis equation represents SHM whose time period,NowIf r<<

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