Pick out the wrong statement ?

A. For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire

B. The equivalent stiffness of two springs (of equal stiffness S) in series is S/2 while in parallel

C. Modulus of resilience is proportional to (stress at elastic limit)2

D. meter)

E. Crushing load or columns is less than the buckling load

F. 2S

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