Rotational Motion Question 75

Question: ABC is an equilateral triangle with O as its centre. F1,F2 and F3 represent three forces acting along the sides AB, BC and AC respectively. If the total torque about O is zero then the magnitude of F3 is

[AIPMT (S) 2012]

Options:

A) F1+F2

B) F1F2

C) F1+F22

D) 2(F1+F2)

Show Answer

Answer:

Correct Answer: A

Solution:

  • If we take clockwise torque

    τ=τF1+τF2+τF3

    0=F1r+F2r+F3r

    F3=F1+F2



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