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Work done by the couple is best given by___________

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Work done by the couple is best given by___________

(a) dU = Mdθ

(b) dU = M.dθ

(c) dU = Mxdθ

(d) dU = Mθ

The question was posed to me during an online exam.

This is a very interesting question from Work topic in chapter Principle of Virtual Work of Engineering Mechanics

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Correct option is (a) dU = Mdθ

The best explanation: The work done by the couple is defined as the product of the moment and the del angle. This means that the work done does depends upon the angle of the moment. That is the angle which is being made by the moment vector to the surface of action of the moment.

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