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A closely coiled spring of 20 cm mean diameter is having 25 coils of 2 cm diameter. Modulus of rigidity of the material is Stiffness of spring is: 7 2 10 N / cm .                                         

(a) 50 N/cm                    (b) 250 N/cm

(c) 100 N/cm                  (d) 500 N/cm

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