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Questions  

ABC is an equilateral triangle with O as its centre. F1, F2 and F3 represent three forces acting along the sides AB, BC and AC respectively. If the total torque about O is zero then the magnitude of F3 is 

a
2(F1+F2)
b
F1 + F2
c
F1 - F2
d
F1+F22

detailed solution

Correct option is B

Taking torque about O, net torque should be zero.F2 × x-F3×x+F1×x = 0F3 = F1+F2

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