A prismatic shaft (diameter d0 5 19 mm) is loaded by torque T1. A stepped shaft (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by torque T2. The allowable shear stress in the material is 42 MPa. The ratio T1/T2 of the maximum permissible torques that can be applied to the shafts, considering stress concentration effects in the stepped shaft is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
(B) 1.2
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