One circular ring and one circular disc, both are having the same mass and radius. The ratio of their moments of inertia about the axes passing through their centres and perpendicular to their planes, will be

Options

A. `1:1`
B. `2:1`
C. `1:2`
D. `4:1`

Answer

B

Explanation

Moment of inertia of circular ring and circular disc about the axes passing through their centres and perpendicular to their planes are `MR^(2)` and `(1)/(2)MR^(2)` respectively, So, the disired ratio is `(MR^(2))/((1//2)MR^(2))=2:1`.