Calculate the total angle of twist for a stepped shaft which is subjected to the torque (T) as shown in the figure below.
1
\(\frac{{Tl}}{{\pi G{d^4}}}\)
2
\(\frac{{66Tl}}{{\pi G{d^4}}}\)
3
\(\frac{{Tl}}{{66G{d^4}}}\)
4
\(\frac{{36Tl}}{{\pi G{d^4}}}\)
5
\(\frac{{32Tl}}{{\pi G{d^4}}}\)