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

Question

$\left( {{{5q} \over {7s{p^2}}}} \right)$

$\left( {{{7q} \over {5s{p^2}}}} \right)$

$\left( {{{2q} \over {5sp}}} \right)$

$\left( {{{7q} \over {5sp}}} \right)$

Solution

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