$ABC$ is an equilateral triangle with $O$ as its centre. $\vec F_1, \vec F_2 $and $\vec F_3$ represent three forces acting along the sides $AB, BC$ and $AC$ respectively. If the total torque about $O$ is zero then the magnitude of $\vec F_3$ is
$ABC$ is an equilateral triangle with $O$ as its centre. $\vec F_1, \vec F_2 $and $\vec F_3$ represent three forces acting along the sides $AB, BC$ and $AC$ respectively. If the total torque about $O$ is zero then the magnitude of $\vec F_3$ is
- [AIPMT 1998]
- [AIPMT 2012]
- A
$({F_1} + {F_2})/2$
- B
$2\,({F_1} + {F_2})$
- C
$({F_1} + {F_2})$
- D
$({F_1} - {F_2})$
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