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System of Particles and Rotational Motion

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System of Particles and Rotational Motion
  1. ABC is an equilateral triangle with O as its centre.  and represent three forces acting along the sides AB, BC and AC respectively. If the total torque about O is zero the magnitude of →F is :

    1. F1 + F2
    2. F1 – F2
    3. F1 + F2
      2
    4. 2(F1 + F2)
Correct Option: A

F1 x + F2 x = F3 x
F3 = F1 + F2


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