A solid circular shaft AC of total length L=L1+L2 is fixed against rotation at ends A and C and is loaded by a tourqe T_b at joint B. If the diameter of the two segements of the shaft are in ratio d2/d1 what ration of lengths L2/L1, will cause the maximum shear stress to ne the same in the two segements, that is will max tau _max_1=tau_max_2 .