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Four charged particles are at the corners of a square of side $a$ as shown in the figure below. $($Let $A=5,B=5,$ and $C=7.)$

$($a$)$ Determine the electric field at the location of charge $q.($Use the following as necessary: $q,a,$ and $k_e.)$

$($b$)$ Determine the total electric force exerted on $q.($Use the following as necessary: $q,a,$ and $k_e.)$

magnitude $\frac{k_{e}39\mathrm{.}1q^2}{4a^2}$

direction

$($counterclockwise from the $+x-$axis$)$