The axial deflection of spring for the small angle of θ is given by?
(a) 328PDᵌN/Gd⁴
(b) 8PDᵌN/Gd⁴
(c) 16PDᵌN/Gd⁴
(d) 8PD²N/Gdᵌ
I faced this question in my board exam.
This theoretical question is from the Design of Helical Springs in chapter Springs of Machine Design