A cylindrical wire of radius $1\,\, mm$, length $1 m$, Young’s modulus $= 2 × 10^{11} N/m^2$, poisson’s ratio $\mu = \pi /10$ is stretched by a force of $100 N$. Its radius will become
A$0.99998\,\, mm$
B$0.99999\,\, mm$
C$0.99997 \,\,mm$
D$0.99995 \,\,mm$
Diffcult
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D$0.99995 \,\,mm$
d
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