QUESTION $($i$)$

ANSWER

An object with a charge of $+4C$ is very close to an object with a charge of $-1C,$ each one fixed in place. Which of the following is the best expression for the magnitude of the electric field we would find at a distance vec$(r)$ far away from the pair of objects?

$E=\frac{1}{4lo{n}_0}\frac{(+4C)(-1C)}{r^2}$

$E=\frac{1}{4lo{n}_0}\frac{(+3C)}{r^2}$

$E=\frac{1}{4lo{n}_0}\frac{(-4C)}{r^2}$

$E=\frac{1}{4lo{n}_0}\frac{(4C)}{r^2}+\frac{1}{4lo{n}_0}\frac{(1C)}{r^2}$

IDON'T KNOWYET