Two bars \( A \) and \( B \) of circular cross section, same volume and made of the same materia...

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Two bars \( A \) and \( B \) of circular cross section, same volume and made of the same material, are subjected to tension. If the diameter of \( A \) is half that of \( B \) and if the force applied to both the rod is the same and it is in the elastic limit, the ratio of extension of \( A \) to that of \( B \) will be
(1) 16
(2) 8
(3) 4
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