A 10 mm diameter bar of mild steel of elastic modulus 200 × 109 Pa is subjected to a tensile load of 50000 N, taking it just beyond its yield point. The elastic recovery of strain that would occur upon removal of tensile load will be
1
1.38 × 10-3
2
2.68 × 10-3
3
3.18 × 10-3
4
4.62 × 10-3