Two light strings, each of length l, are fixed at points A and B on a fixed horizontal rod xy. A small bob is tied by both strings and in equilibrium, the strings are making angle $$45$$° with the rod. If the bob is slightly displaced normal to the plane of the strings and released then period of the resulting small oscillation will be:

Question

Infinity Learn · Accepted Answer

Resulting torque on the bob $$=$$ $$mgl2sin$$θMI of bob about axis xy $$=$$ $$ml22For$$ small angle θω $$=$$ $$2gl$$   ⇒ T $$=$$ $$2$$$$π$$$$l2g$$

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