The spring index of a helical spring is calculated by the following: (a) Ratio of wire diameter to mean coil diameter
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![The spring index of a helical spring is calculated by the following:
(a) Ratio of wire diameter to mean coil diameter.
(b) Force per unit cross-sectional area of spring
(c) Force required to produce unit deflection
(d)Ratio of mean coil diameter to wire diameter.
Which one is correct?
O a. Option (a) only
O b. Option (b) only
O c. Options (c) & (d) only
O d. Option (d) only](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbc4dbe9b-dace-4d49-a602-7f2817e7a024%2F0bd81178-f995-4018-ab2b-813a827d92d1%2F33zgwxs_processed.jpeg&w=3840&q=75)
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