A rod of length l and radius r is jointed to a rod of length l/2 and radius r/2 of same material . The free end of small rod is fixed to a rigid base and the free end of larger rod is given twist of 0° the twist angle at a joint will be
A)Ø/4
B)Ø/2
C)5Ø/6
D)8Ø/9
