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: 28 O is the centre of an equilateral triangle ABC. F1, F2 and Fz are three forces acting along the sides AB, BC and AC as shown in figure F F2 What should be the magnitude of F3 so that the total torque about O is zero? b) (F1-F2) a) (+F3) d) 2(F1+F2) .) (F1+F2)

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