Which of the following expressions is correct for the elongation in bar due to the self-weight? (W = weight, L = of bar, E = Young's modulus of material of bar)
1
elongation = \(\frac{W}{2 E L} \)
2
elongation = \(\frac{L}{2 W E} \)
3
elongation = \(\frac{W L}{2\times A E} \)
4
elongation = \(\frac{W}{2 E}\)