A helical coil spring with wire diameter d and mean coil diameter D is subjected to axial load. A constant ratio of D and d has to be maintained, such that the extension of the spring is independent of D and d. What is the ratio?

\(\frac{{{D^{\frac{4}{3}}}}}{{{d^3}}}\)

\(\frac{{{d^{\frac{4}{3}}}}}{{{D^3}}}\)

A helical coil spring with wire diameter d and mean coil diameter D is

1.	A helical coil spring with wire diameter d and mean coil diameter D is subjected to axial load. A constant ratio of D and d has to be maintained, such that the extension of the spring is independent of D and d. What is the ratio?
A.	\(\frac{{{D^3}}}{{{d^4}}}\)
B.	\(\frac{{{d^3}}}{{{D^4}}}\)
C.	\(\frac{{{D^{\frac{4}{3}}}}}{{{d^3}}}\)
D.	\(\frac{{{d^{\frac{4}{3}}}}}{{{D^3}}}\)
Answer» B. \(\frac{{{d^3}}}{{{D^4}}}\)

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A helical coil spring with wire diameter d and mean coil diameter D is subjected to axial load. A constant ratio of D and d has to be maintained, such that the extension of the spring is independent of D and d. What is the ratio?

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