A disc is a spinning with an angular velocity $$\omega $$ rad/s about the axis of spin. The couple applied to the disc causing precession will be (where $$I$$ = Mass moment of inertia of the disc and $$\omega {\text{P}}$$ = Angular velocity of precession of the axis of spin)
A
$$\frac{1}{2}I{\omega ^2}$$
B
$$I{\omega ^2}$$
C
$$\frac{1}{2}I\omega \omega {\text{P}}$$
D
$$I\omega \omega {\text{P}}$$
Correct Answer: $$I\omega \omega {\text{P}}$$
