A torsion member is fabricated from two concentric thin tube

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SSC JE CE 2016 Set 1 (Technical)
Civil Engineering
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Civil Engineering

31

M: +1.00/-0.25

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 'τ', then the shear stress in the inner tube will be ______.

[SSC JE CE 2016 Set 1 (Technical)]

A τ

B 0.25 τ

C 0.75 τ

D 0.5 τ