A copper wire of diameter $1.6 mm$ is stretched within its limit of proportionality by a tensile force of $430N$.
The Young modulus of copper is $130GPa$.
What is the strain in the wire?
1 )
$4.1 \times 10^{-4}$
2 )
$1.3 \times 10^{-3}$
$1.6 \times 10^{-3}$
4 )
$5.2 \times 10^{-3}$
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