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Question
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)
Options:
A .  Gd⁴/ 8D3n
B .  Gd3/ 8D3n
C .  Gd⁴/ 4D3n
D .  Gd⁴/ 8D²n
Answer: Option A
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