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5.Two wires A and B of same length and of the same material have the respective radii and . Their one end is fixed with a rigid support, and at the 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

(a) r1 2 /r2 2                                         (b) r2 2 /r1 2

(c) r2 4 /r1  4                                        (d)  r1 4 /r2 4

Answer-c

(6)

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