The stiffness of the close coil helical spring is
\( \frac { d^2N } { 8D^3n } \)
\( \frac { d^4N } { 4D^3n } \)
\( \frac { 4D^4N } { d^4n } \)
\( \frac { 8D^3N } { d^4n } \)
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Answer : Option A
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