The surface mass density of a disc of radius a varies with radial distance as `sigma = A + Br` where A & B are positive constants then moment of inertia of the disc about an axis passing through its centre and perpendicular to the plane

Options

A. `2pia^4(A/4+Ba/5)`
B. `2pia^4(Aa/4+B/5)`
C. `pia^4(A/4+Ba/5)`
D. `3pia^4(A/4+Ba/5)`

Answer

A

Explanation

NA