A closely-coiled helical spring is made of 10 mm diameter steel wire, with the coil consisting of 10 turns with a mean diameter 120 mm. The spring carries an axial pull of 200 N. What is the value of shear stress-induced in the spring neglecting the effect of stress concentration and of deflection in the spring, when the modulus of rigidity is 80 kN/mm2?

A closely-coiled helical spring is made of 10 mm diameter steel wire,

1.	A closely-coiled helical spring is made of 10 mm diameter steel wire, with the coil consisting of 10 turns with a mean diameter 120 mm. The spring carries an axial pull of 200 N. What is the value of shear stress-induced in the spring neglecting the effect of stress concentration and of deflection in the spring, when the modulus of rigidity is 80 kN/mm2?
A.	63.5 N/mm2 and 34.6 mm
B.	54.2 N/mm2 and 34.6 mm
C.	63.5 N/mm2 and 42.6 mm
D.	4.2 N/m2 and 42.6 mm
Answer» B. 54.2 N/mm2 and 34.6 mm

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