The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight________________?
(A) of same magnitude as that of bar and applied at the lower end
(B) half the weight of bar applied at lower end
(C) half of the square of weight of bar applied at lower end
(D) one-fourth of weight of bar applied at lower end
(E) none of the above
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