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Q.

An equilateral triangle ABC has its centre at O as shown in figure. Three forces 10 N, 5N and F are acting along the sides AB, BC and AC. Magnitude of F so that the net torque about ‘O’ is zero is 

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a

5 N

b

15 N

c

2 N

d

12N

answer is A.

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Detailed Solution

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Fd – 10d – 5d = 0;      F = 15 N

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