Wahl’s stress concentration factor is
(a) (4C – 1)/ (4C – 3) + 0.615/C
(b) (4C – 1)/ (4C – 2) + 0.615/C
(c) (4C – 1)/ (4C – 4) + 0.615/C
(d) None
(a) (4C – 1)/ (4C – 3) + 0.615/C
(b) (4C – 1)/ (4C – 2) + 0.615/C
(c) (4C – 1)/ (4C – 4) + 0.615/C
(d) None