Two rods A and B of the same material and length have radii `r_(1)` and `r_(2)`respective. When they are rigidly fixed at one end and twisted by the same torque applied at the other end, the ratio `[("the angle of twist at the end of A")/("the angle of twist at the end of B")]` equal to

Two rod A and B of the same material and dame length have radii r_(1) and r_(2) respectively. When they are rigidly fixed at one end and twisted by the same couple applied at the other end, find the ratio of the angles of twist at the ends of A and B.

Two wires A and B of same length and of the same material have the respective radii r_(1) and r_(2) . Their one end is fixed with a rigid support, and at other end equal twisting couple is applied. Then the ratio of the angle of twist at the end of A and the angle of twist at the end of B will be

Two cylinders A and B of the same matieral have same length, their radii being in the ratio of 1:2 repectively. They are joined end to end as shown in figure. The upper end of A is rigidly fixed. The lower end of B is twised through an angle theta , the angle of twist of the cylinder A is: