When a close coiled helical spring of mean diameter (D) is subjected to an axial load (w), the deflection of the spring is ((n) is number of coils and (d) is diameter of wire) :
1
\(\rm \frac{4wD^3n}{Gd^4}\)
2
\(\rm \frac{8wD^3n}{Gd^4}\)
3
\(\rm \frac{16wD^3n}{Gd^4}\)
4
\(\rm \frac{32wD^3n}{Gd^4}\)
5
Question Not Attempted