When an open coiled

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Question

When an open
coiled helical compression spring is subjected to an axial compressive
load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

Options:

A . `(W.D)/(pi d^3) xx K`

B . `(2W.D)/(pi d^3) xx K`

C . `(4W.D)/(pi d^3) xx K`

D . `(8W.D)/(pi d^3) xx K`

Answer: Option D

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