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The main condition for the stability of the equilibrium configuration is that the distance between various particles of the body does change.

(a) True

(b) False

I had been asked this question in final exam.

Query is from Stability of Equilibrium Configurations in section Principle of Virtual Work of Engineering Mechanics

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Right choice is (b) False

To explain I would say: The main condition for the rigid body is that the distance between various particles of the body does not change. If the distance does change the body is not to be called as rigid. Thus the fix distance of the particles is very much required for the equilibrium of the rigid body.

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