Three point masses each of mass m are placed at the corners of an equilateral triangle of side ‘a ‘ . Then the moment of inertia of this system about an axis passing along one side of the triangle is

Q: Three point masses each of mass m are placed at the corners of an equilateral triangle of side ‘a ‘ . Then the moment of inertia of this system about an axis passing along one side of the triangle is

(a) ma²

(b) 3 ma²

(c) (3/4) ma²

(d) (2/3) ma²

Ans: (c)