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(c) Two circular metal rods of the same dimensions but different materials are welded together at one end to form a single, longer rod.

(c) Two circular metal rods of the same dimensions but different materials are welded together at one end to form a single, longer rod. If the elastic moduli are in the ratio 1.2E = E2, and the Poisson's ratio of one rod is v = 0.3, what should the Poisson's ratio of the second rod be so that the lateral contractions of the rods at the weld are equal when the rods are under axial load?

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