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 2r and that of the inner tube is r. If the shear stresses developed in the outer tube is , 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 2r and that of the inner tube is r. If the shear stresses developed in the outer tube is , then the shear stress in the inner tube will be.
A.
B.	0.25
C.	0.75
D.	0.5
Answer» E.