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A steel wire of length 4 to 7m & cross sectional area 3*10-5m2 stretches by the same amount as a copper wire of length 3.5m & cross sectional area of 4*10-5m2 under a given load.What is the ratio of the young's modulus of steel to that of copper?
1) For steel: l = 4.7 m, A = 3.0 × 10-5 m2
For copper: l = 3.5m, A = 4.0 × 10-5m2
Applied force F and extension ?l are same for both wires.
? Young's modulus of steel,




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