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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

A

`(r_1^(2))/(r_2^(2))`

B

`(r_2^(2))/(r_2^(1))`

C

`(r_2^(4))/(r_1^(4))`

D

`(r_4^(1))/(r_4^(2))`

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