( a ) ?Three point charges, A = 1 . 5 0 C , ?B = 6 . 7 5

$($a$)$ ?Three point charges, A $=1\mathrm{.}50\mu$C$,$ ?B $=6\mathrm{.}75\mu$C$,$ ?and C $=$ ?$?4\mathrm{.}15$?$\mu$C$,$ ?are located at the corners of an equilateral triangle as in the figure. Find the magnitude and direction of the electric field at the position of the $1\mathrm{.}50\mu$C charge.

-2.5 1.0 m 6.0