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

\( \frac{{G{d^4}}}{{2{D^3}n}}\)

\( \frac{{G{d^4}}}{{4{D^3}n}}\)

\( \frac{{G{d^4}}}{{8{D^3}n}}\)

When a closely-coiled helical spring of mean diameter (D) is subjected

1.	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
A.	\( \frac{{G{d^4}}}{{{D^3}n}}\)
B.	\( \frac{{G{d^4}}}{{2{D^3}n}}\)
C.	\( \frac{{G{d^4}}}{{4{D^3}n}}\)
D.	\( \frac{{G{d^4}}}{{8{D^3}n}}\)
Answer» E.