A + 7.3 nC point charge and a - 2.4 nC point charge are 3.5 cm apart. What is the electric field strength at the midpoint between the two charges?
E = 9*10^9(q/r^2)
q = charge
r = distance from point charge
The Attempt at a Solution
Since the question asks for the field strength between the two charges, r would be 1.75 cm or .0175 m.
E = E1+E2
Except it says I'm wrong. Its multiple choice, and the other choices given are