Which of the following cases will have the greatest strain energy (F is the stretching force, A is the area of cross section and s is the strain)
(a) F = 10 N, A = 1 cm2, s = 10–3
(b) F = 15 N, A = 2 cm2, s = 10–3
(c) F = 10 N, A = 2 1 cm2, s = 10–4
(d) F = 5 N, A = 3 cm2, s = 10–3