Four similar point masses ( each of mass m ) are placed on the circumference of a disc of mass M and radius R . The M.I of the system about the normal axis through the centre O will be : -

Options

A. `MR^(2)+4mR^(2)`
B. `1/2 MR^(2)+4mR^(2)`
C. `MR^(2)+8/5mR^(2)`
D. None of these

Answer

B

Explanation

`(MR^(2))/2 + 4(mR^(2))`