Four identical particles of mass m are kept at the four corners of a square. If the gravitational force exerted on one of the masses by the other…

Four identical particles of mass $\displaystyle m$ are kept at the four corners of a square. If the gravitational force exerted on one of the masses by the other masses is $\displaystyle \left(\frac{2 \sqrt{2}+1}{32}\right) \frac{G m^2}{L^2}$, the length of the sides of the square is