Question

In an equilateral triangle ABC, F1, F2 and F3 are
three forces acting along the sides AB, BC and AC
as shown in the given figure. What should be the
magnitude of F3 so that the total torque about O is
zero :-
(1) 2 N
(3) 6 N
(2) 4 N
(4) 8 N​

Answer 1

Explanation:

refer above attachment