Physics · 2013
JEE Main · 23 April 2013, Shift 1 · Q12
A copper wire of length 1.0 m and a steel wire of length 0.5 m having equal cross-sectional areas are joined end to end. The composite wire is…
A copper wire of length $\displaystyle 1.0$ m and a steel wire of length $\displaystyle 0.5$ m having equal cross-sectional areas are joined end to end. The composite wire is stretched by a certain load which stretches the copper wire by $\displaystyle 1$ mm . If the young's modulii of copper and steel are respectively $\displaystyle 1.0 \times 10^{11} \mathrm{Nm}^{-2}$ and $\displaystyle 2.0 \times 10^{11} \mathrm{Nm}^{-2}$, the total extension of the composite wire is :
Official answer
(4)
1.$\displaystyle 25$ mm
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.