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Two rods A and B of the same material an...

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

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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