is a distance $r_3=2\mathrm{.}00cm$ to the right of the marble $q_2,$ as shown.

Calculate the magnitude of the electric field a distance $r^{\text{'}}=1\mathrm{.}00cm$ to the left of the center marble.

What is the electric field due to each individual marble? How do you find the total or "net" electric field when you have several electric fields? N$/$C

Another marble is placed $1cm$ to the left of the middle marble. If this new marble has a charge of $3\mathrm{.}90C,$ calculate the magnitude and direction of the force on it$.$

magnitude $N$

direction $,--$ Select$---vv$