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NEET2008PhysicsMathematics in PhysicsActual

Three forces acting on a body are shown in the figure. To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is

Options

  1. A3 ~N
  2. B0.5 ~N
  3. C1.5 ~N
  4. D3 4 ~N

Correct answer

B. 0.5 ~N

Step-by-step solution

Net force along x -axis zero. Let the unknown force be F along x -axis aligned & F+1 30^ +2 30^ -4 30^ =0 & |F|=0.5 ~N aligned

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