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

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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.	Cd⁴/D³n
B.	Cd⁴/2D³n
C.	Cd⁴/4D³n
D.	Cd⁴/8D³n
Answer» E.

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