A ring and a disc have same mass and same radius. The ratio of moment of inertia of a ring about a tangent…
A ring and a disc have same mass and same radius. The ratio of moment of inertia
of a ring about a tangent in its plane to that of the disc about its diameter is
$6: 1$
$4: 1$
$2: 1$
$8: 1$
Solution
Moment of inertia of a ring about a tangent in its plane is given by $I=\frac{3}{2} M R^{2}$
Moment of inertia of a disc about its diameter is given by $I^{\prime}=\frac{1}{4} M R^{2}$
$\therefore \frac{I}{I^{\prime}}=6$