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If the ratio of diameters, lengths and Young's modulus of steel

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If the ratio of diameters, lengths and Young's modulus of steel and copper wires shown in the figure are p, q and s respectively, then the corresponding ratio of increase in their lengths would be

(a) 5q/(7sp2)

(b) 7q/(5sp2)

(d) 2q/(5sp)

(d) 7q/(5sp)

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Best answer

Correct option (b) 7q/(5sp2)

Explanation:

where subscripts S and C refer to copper  and steel respectively. Here

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