Speed of a transverse wave on a straight wire (mass $6.0\; \mathrm{g}$, length $60\; \mathrm{cm}$ and area of cross-section $1.0\; \mathrm{mm}^{2}$ ) is $90\; \mathrm{ms}^{-1} .$ If the Young's modulus of wire is $16 \times 10^{11}\; \mathrm{Nm}^{-2},$ the extension of wire over its natural length is
JEE MAIN 2020, Medium
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$\mathrm{v}=\sqrt{\frac{\mathrm{T}}{\mu}}$
$90=\sqrt{\frac{\mathrm{YA}}{\mathrm{m}}}=\sqrt{\frac{16 \times 10^{11} \times 10^{-6} \times \Delta l}{6 \times 10^{-3}}}$
$=\frac{8100 \times 3}{8} \times 10^{-8}=\Delta l=0.03\;mm$
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