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A helical spring has N turns of coil of diameter D, and a second spring made of same wire diameter and a same material has N/2 turns of coil of diameter 2D. If the stiffness of the first spring is k, then the stiffness of the second spring will be

(a) k/4                 (b) k/2                   

(c) 2 k                 (d) 4 k

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