Goal: Hone the vector nature of the electric field
charges are positioned as shown. What is the direction of the
electrical field at the origin?
- Along i or in the +x direction
- Along j or in the +y direction
- Along -i or in the -x direction
- Along -j or in the -y direction
- Along some other direction
- E=0 at the origin
(6) Difficulty with this question usually indicates that students are
not familiar with vectors. Good follow up questions are to change the
sign of one or more charges.