Problem 10-38 Addition of Electric fields - A

Diagram of two negative charges.

Two negative charges have locations as shown in the Figure. Charge \(q_1\) is  \(-3.6\times 10^{-8} C;\) charge \(q_2\) is  \(-5.2 \times10^{-8} C.\) What is the electric field (magnitude and direction) at (a) \(\text{point A}\)? (b) \(\text{point B}\)?

No. To determine the direction of the field at \(A\) due to \(q_1\) we imagine placing a small test charge at \(A\) and observing the direction of the force on it. The charge should be Positive or Negative choose one.