Question

A ring has greater moment of inertia than a circular disc of same mass and radius, about an axis passing through its centre of mass perpendicular to its plane, because

• A. all mass is at maximum distance from axis
• B. because the centre of the ring does not lie on it
• C. because the ring needs greater inertia to bend it
• D. because the moment produced in the ring is more

Answer 1

The correct option is A

all mass is at maximum distance from axis

A ring has a larger moment of inertia because its entire mass is concentrated at the rim at maximum distance from the axis.