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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
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7q (5sp) -
5q (7sp²) -
7q (5sp²) -
2q (5sp)
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Correct Option: C
From formula,
| Increase in length = ΔL = | = | ||
| AY | πD²Y |
| = |  |  | ² | = | × | | | ² | | | q | ||||||||
| ΔLc | Fc | Ds | Yc | Lc | 5 | p | s |
| = | ||
| (5sp²) |
