Maximum shear stress in a solid shaft of diameter D and length L twisted through an angle \[\theta \] is \[\tau \] A hollow shaft of same material and length having outside and inside diameters of D and D/2 respectively is also twisted through the same angle of twist \[\theta .\] The value of maximum shear stress in the hollow shaft will be.

• A. \[\frac{16}{15}\tau \]
• B. \[\frac{8}{7}\tau \]
• C. \[\frac{4}{3}\tau \]
• D. \[\tau \]