On all the six surfaces of a unit cube, equal tensile force of \( F \) is applied. The increase ...

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On all the six surfaces of a unit cube, equal tensile force of \( F \) is applied. The increase in length of each side will be \( (Y= \) Young's modulus, \( \sigma= \) Poission's ratio)
(a) \( \frac{F}{Y(1-\sigma)} \)
(b) \( \frac{F}{Y(1+\sigma)} \)
(c) \( \frac{F(1-2 \sigma)}{Y} \)
(d) \( \frac{F}{Y(1+2 \sigma)} \)
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