Polar moment of inertia of a hollow shaft having D and d as outer and inner diameters, is given by:
1
\(\frac{\pi}{8}\left({{D^4} - {d^4}} \right)\)
2
\(\frac{\pi}{{32}}\left({{D^4} - {d^4}} \right)\)
3
\(\frac{\pi}{{64}}\left({{D^4} - {d^4}} \right)\)
4
\(\frac{\pi}{{12}}\left({{D^4} - {d^4}} \right)\)