$(10\%)$ Problem $9$: In the figure, three point charges are located at the corners of an equilateral triangle

with side lengths of $30\mathrm{.}2cm.25\%$ Part $($a$)$ Find the magnitude of the electric field, in newtons per coulomb, at the location of charge $q_a,$ given that $q_b=8\mathrm{.}83C$ and $q_c=-4\mathrm{.}46C.$

Grade Summar

Deductions$25\%$ Part $($b$)$ Find the direction of the electric field at the location of $q_a$ in degrees clockwise from the negative $x$ direction.

${}_{E_a}\frac{?}{{?}_{\frac{?}{?}}}=25\%$ Part $($c$)$ What is the magnitude, in newtons, of the force on charge $q_a$ given that $q_a=1\mathrm{.}79nC?$

$F_a\frac{?}{{?}_{\frac{?}{?}}}=25\%$ Part $($d$)$ What is the direction of the force on charge $q_a$ in degrees clockwise from the negative $x$ direction?

${}_{F_a}=$