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(C) an ellipseA ball is suspended by a thread of length L at the point O on a wall which is inclined to the vertical by α. Thethread with the ball is displaced by a small angle β away from the vertical and also away form the wall ftheball is released, the period ofoscil lation ofthe pendulum when β > α will beAIIMS 2009)(A) 11-1 π + 2 sin-1 αC)2sin--1 α

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