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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. Cd⁴/D³n

B. Cd⁴/2D³n

C. Cd⁴/4D³n

D. Cd⁴/8D³n

Correct Answer :

D. Cd⁴/8D³n

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