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Which of following is true about couple forces?

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$F_{n e t} = 0$

$τ_{n e t} \neq 0$

Body remains in translational equilibrium but not in rotational equilibrium

All of above

answer is D.

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Detailed Solution

A couple when applied to a body it produce
(i) Pure rotation
(ii) It can be replaced by any other couple of same moment.
(iii) The resultant of set of two or more couples is equal to the sum of moment of individuals couples.

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