Question

The moment of inertia of a circular disc about an axis passing through the circumference perpendicular to the plane of the disc is

• A. $M{R}^2$
• B. $\frac{3}{2}M{R}^2$
• C. $\frac{M{R}^2}{2}$
• D. $\frac{5}{4}M{R}^2$

Answer 1

The correct option is B $\frac{3}{2}M{R}^2$

$I=I_{cm}+m{R}^2=\frac{m{R}^2}{2}+m{R}^2=\frac{3m{R}^2}{2}$