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  A closed – coiled helical spring is made of 5mm diameter wire coiled to 50 mm mean diameter. Maximum shear stress in the spring under the action of an axial force is 20 N/mm2. The maximum shear stress in a spring made of 3mm diameter wire coiled to 30 mm mean diameter under the action of the same force will be nearly

(a) 20 N/mm2                  (b) 33.3 N/mm2    

(c)55.6 N/mm2                (d) 92.6 N/mm2     

 

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