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. $$I\omega \omega {\text{P}}$$

Answer: Option D