When a closely-coiled

Question

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

Options:

A . `(Cd^4)/(D^3 n)`

B . `(Cd^4)/(2D^3 n)`

C . `(Cd^4)/(4D^3 n)`

D . `(Cd^4)/(8D^3 n)`

Answer: Option D

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