Three objects each of mass 'm' are placed at the corners of an equilateral triangle of side 'l' . What is the gravitational force acting on each mass due to other masses is

$\text{1)}\frac{{\text{Gm}}^{2}}{\sqrt{3{\text{l}}^{2}}}\phantom{\rule{0ex}{0ex}}\text{2)}\frac{\sqrt{3}{\text{Gm}}^{2}}{2{\text{l}}^{2}}\phantom{\rule{0ex}{0ex}}\text{3)}\frac{\sqrt{3}{\text{Gm}}^{2}}{{\text{l}}^{2}}\phantom{\rule{0ex}{0ex}}\text{4)}\frac{{\text{Gm}}^{2}}{{\text{l}}^{2}}$

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