Moment of inertia of a disc about its own axis is I. Its moment of inertia about a tangential axis in its plane is

Options

A. `(5)/(2)` I
B. 3 I
C. `(3)/(2)` I
D. 2 I

Answer

A

Explanation

`(MR^(2))/(2)=IimpliesMR^(2)=2I`
MOI about a tangent
`I.=(MR^(2))/(4)+MR^(2)=(5)/(4)MR^(2)`
implies `I.=(5)/(2)I`