Question

Object A, which has been charged to +10.08 nC, is at the origin. Object B, which has been charged to -29.04 nC, is at x=0 and y=4.27 cm. What is the magnitude of the electric force, in micro-Newtons, on object A?

Answer 1

We will have the following:

$\begin{gathered} F_e=(8.988\ast10^9Nm^2C^{-2})\frac{(1.008\ast10^{-8}C)(-2.904\ast10^{-8}C)}{(0.0427m)^2}\Rightarrow F_e=-1.442993776\ast10^{-3}N \\ \\ \Rightarrow|F_e|\approx1440mN \end{gathered}$

So, the magnitude of the electric force is approximately 1440 micro-meters.