3. Four identical positive charges are placed on the corners of a square. A four

Question

3. Four identical positive charges are placed on the corners of a square. A fourth negative charge is placed at the square's center. If an external electric field pointing uniformly from left to right is turned on, what force will the electron experience? a) No force because the four charges deflect the external field and their own fields cancel at the center. b) A force to the right because the electron is pushed by the field lines. c) A force to the left because the negative charge is attracted to the positive source of the electric field. d) No force, there has to be a source charge.

Explanation / Answer

Option A.

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