The angle of twist for the equivalent bar to a spring is given by? (Symbols have their usual meaning)
(a) 8PD²N/Gd⁴
(b) 16PD²N/Gd⁴
(c) 16PDN/Gdᵌ
(d) 8PDN/Gdᵌ
This was presented to me in a viva voce.
This concept-based question is from the Design of Helical Springs module in unit Springs of Machine Design