SSC SSC JE Civil 2025 Mock Test Series (Paper 1 & Paper 2) Strength of Materials Springs Closed Coil Helical Spring Under Axial Pull
When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness of the spring is given by
1
Gd4/D3n
2
Gd4/4D3n
3
Gd4/2D3n
4
Gd4/8D3n