SAT Subject Physics Practice Question 284: Answer and Explanation
Two equal but opposite point charges are fixed in position on the x and y axes, as shown in the figure above. Which of the following arrows best illustrates the direction of the resulting electric field at the origin, O?
Correct Answer: D
The electric field vector at the origin is the sum of the individual electric field vectors due to the two source charges. The diagrams below show that the net electric field vector at the origin points down and to the right.