\( A B C \) is an equilateral triangle with \( O \) as its centre. \( F_{1}, F_{2} \) and \( F_{....

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\( A B C \) is an equilateral triangle with \( O \) as its centre.
\( \mathrm{P} \)
\( F_{1}, F_{2} \) and \( F_{3} \) represent three forces acting along the sides \( A B, B C \) and \( A C \), respectively. If the total torque about \( O \) is zero, then the magnitude of \( F_{3} \) is
(1) \( F_{1}+F_{2} \)
(2) \( F_{1}-F_{2} \)
(3) \( \frac{F_{1}+F_{2}}{2} \)
(4) \( 2\left(F_{1}+F_{2}\right) \)


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