The Young's modulus of a wire is $y$. If the energy per unit volume is $E$, then the strain will be
The Young's modulus of a wire is $y$. If the energy per unit volume is $E$, then the strain will be
- A
$\sqrt {\frac{{2E}}{y}} $
- B
$E\sqrt {2y} $
- C
$Ey$
- D
$\frac{E}{y}$
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