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A couple moment is a _______ vector.

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A couple moment is a _______ vector.

(a) Gradient

(b) Scalar

(c) Del

(d) Free

This question was posed to me in my homework.

Asked question is from Moment of a Couple topic in division Force System Resultants of Engineering Mechanics

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Right option is (d) Free

The best explanation: A couple moment is a free vector. It can act anywhere between the forces. As the couple is formed by two forces acting in the opposite directions. These forces are separated by a distance r, say, then the moment caused by them can act anywhere in between these forces.

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