Question

In an equilateral triangle $ABC$, $F_{1},F_{2}$ and $F_{3}$ are three forces acting along the sides $AB, BC$ and $AC$ as shown in the given figure. What should be the magnitude of $F_3$, so that the total torque about $O$ is zero ?

• A. 2 N
• B. 4 N
• C. 6 N
• D. 8 N

Answer 1

Answer: (C)

6 N

Answer 2

Torque is defined as
$\tau=$ force $\times$ perpendicular distance from axis of rotation