A uniform bar of length \( L \) and cross sectional area \( A \) is subjected to a tensile l...

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A uniform bar of length \( L \) and cross sectional area \( A \) is subjected to a tensile load \( F \) . \( Y \) be the Youngs modulus and \( \sigma \) be the Poissons ratio then volumetric strain is
(a) \( \frac{F}{A Y}(1-\sigma) \)
(b) \( \frac{F}{A Y}(2-\sigma) \)
(c) \( \frac{F}{A Y}(1-2 \sigma) \)
(d) \( \frac{F}{A Y} \cdot \sigma \)
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