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Question

Physics Question on mechanical properties of solids

A steel wire of length 4.7m and cross sectional area 3×10−6m23 \times 10^{-6}m^2 stretches by the amount as a copper wire of length 3.5m and cross-sectional area of 4×10−6m24 \times 10^{-6}m^2 under a given load. The ratio of young's modulus of steel to that of copper is

A

1.8

B

3.6

C

0.6

D

8.7

Answer

1.8

Explanation

Solution

Δll×100\frac{\Delta l}{l} \times 100 = 0.2 A=Fy(All)A = \frac{F}{y \left( \frac{Al}{l} \right)}