Four small objects each of mass m are fixed at the corners of a rectangular wire-frame of negligible mass and of sides a and b (a `gt` b). If the wire frame is now rotated about an axis passing along the side of length b, then the moment of inertia of the system for this axis of rotation is

Options

A. `2ma^2`
B. `4ma^2`
C. `2 m (a^2 + b^2)`
D. `2m (a^2- b^2)`

Answer

A

Explanation

Moment of inertia of the system about an axis passing along the side b is `I = ma^2 + 0 + ma^2 + 0 = 2ma^(2)`