Three point$-$like charges are placed as shown in the figure, $a=28\mathrm{.}0cm$ and $b=52\mathrm{.}0cm.$ The charge $(q_3)$ is placed

half way on the $($b$)$ side. Find the magnitude of the electric field at the top right corner. Let $q_1=+2\mathrm{.}50C,q_2=+3\mathrm{.}70$

$C,$ and $q_3=-4\mathrm{.}90C.$

N$/$C