Three point charges are located on a circular arc as shown in the figure below. $($Let $r=4\mathrm{.}24cm.$ Assume that the $+x-$axis is to the right and the $+y-$axis is up along the page.$)$

$($i$)$

$($a$)$ What is the total electric field at $P,$ the center of the arc?

magnitude

direction

$($b$)$ Find the electric force that would be exerted on a $-4\mathrm{.}62nC$ point charge placed at $P.$

magnitude

Your response differs from the correct answer by more than $100\%.$ N

direction