Three equal masses m are placed at the three vertices of an equilateral triangle of side a. The gravitational force exerted by this system on another particle of mass m placed at the mid point of a side

Options

A. `(Gm^2)/(3a^2)`
B. `(4Gm^2)/(3a^2)`
C. `(Gm^2)/a^2`
D. `(Gm^2)/(3a^2)`

Answer

B