Three charged metal spheres, $q_1=-5\mathrm{.}58nC,q_2=3\mathrm{.}02nC,$ and $q_3=-2\mathrm{.}60nC,$ are arrayed in the $xy$ plane so that

they form an equilateral triangle with $d=12\mathrm{.}0cm,$ as shown in the figure. What is the net electrostatic force on the

sphere at the origin?

Your response differs from the correct answer by more than $10\%.$ Double check your calculations. N