The stiffness of the close coil helical spring is_________________?

1.	The stiffness of the close coil helical spring is_________________?
A.	d4N/8D3n
B.	d4N/4D3n
C.	4D3N/d4n
D.	8D3N/d4n
Answer» B. d4N/4D3n

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The stiffness of the close coil helical spring is_________________?

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