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Q.

Which of the following sets of forces acting simultaneously on a particle keep it in equilibrium ?

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a

2 N, 6 N, 5 N

b

3 N, 5 N, 10 N

c

4 N, 7 N, 12 N

d

5 N, 8 N, 1 N

answer is B.

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Detailed Solution

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If three forces acting on the particle form a triangle, the net force will be zero according to triangle law of vector addition.

For the given vectors to form a triangle, sum of any two should be greater than third force and difference between any two vectors should be less than the third side. 

This condition is met by 2 N, 6 N, 5 N only. 

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