A torsion member is fabricated from two concentric thin tubes. At the ends, the tubes are welded to rigid discs so that both the tubes are twisted as a unit. The radius of the outer tube is 2 and that of the inner tube is . If the shear stresses developed in the outer tube is τ, then the shear stress in the inner tube will be.

A torsion member is fabricated from two concentric thin tubes. At the

1.	A torsion member is fabricated from two concentric thin tubes. At the ends, the tubes are welded to rigid discs so that both the tubes are twisted as a unit. The radius of the outer tube is 2 and that of the inner tube is . If the shear stresses developed in the outer tube is τ, then the shear stress in the inner tube will be.
A.	τ
B.	0.25 τ
C.	0.75 τ
D.	0.5 τ
Answer» E.

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