Physics · 2013
JEE Main · 22 April 2013, Shift 1 · Q17
A uniform wire (Young's modulus 2 × 10^11 Nm^-2 ) is subjected to longitudinal tensile stress of 5 × 10^7 Nm^-2. If the overall volume change in the…
A uniform wire (Young's modulus $\displaystyle 2 \times 10^{11} \mathrm{Nm}^{-2}$ ) is subjected to longitudinal tensile stress of $\displaystyle 5 \times 10^7 \mathrm{Nm}^{-2}$. If the overall volume change in the wire is $\displaystyle 0.02 \%$, the fractional decrease in the radius of the wire is close to :
Official answer
(3)
$\displaystyle 0.25 \times 10^{-4}$
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.