Three point charges are located on a circular arc as shown in the figure below. $($Let $r=4\mathrm{.}28cm.$ Assume that the $+x-$axis is to the right and the $+y-$axis is up along the pag

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

magnitude

$\frac{N}{C}$

direction

$($b$)$ Find the electric force that would be exerted on a $-5\mathrm{.}45nC$ point charge placed at $P.$

magnitude

$N$

direction

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