A close coil helical spring of mean diameter D consists of n coils of diameter d

Question

A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is

Options:

A . 4WD²n/d4N

B . 4W²Dn/d4N

C . 4W²D3n/d4N

D . 4W²D3n²/d4N

Answer: Option C

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