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Two wires $A$ and $B$ of same length and of same material have radii $r_1$ and $r_2$ respectively. Their one end is fixed with a rigid support and at other end equal twisting couple is applied. Then ratio of the angle of twist at the end of $A$ and the angle of twist at the end of $B$ will be ..............
  • A$\frac{r_1^2}{r_2^2}$
  • B$\frac{r_2^4}{r_1^4}$
  • C$\frac{r_2^2}{r_1^2}$
  • D$\frac{r_1^4}{r_2^4}$
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