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NEET2012PhysicsRotational MotionActual

A B C is an equilateral triangle with O as its centre. 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

Options

  1. AF₁+F₂
  2. BF₁-F₂
  3. CF₁+F₂ 2
  4. D2 (F₁+F₂ )

Correct answer

A. F₁+F₂

Step-by-step solution

If we take clockwise torque aligned & = _ F₁ + _ F₂ + _ F₃ 0 & =F₁ r+F₂ r+F₃ r F₃ & =F₁+F₂ aligned

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