Need help with "charges" question please!! please help! this must be taught tomorrow in class, and this is my first year teaching. How can I explain it to my students? Q: What point charges, all having the same magnitude, would you place at the corners of a square (one charge per corner), so that both the electric field and the electric potential (assuming a zero reference value at infinity) are zero at the center of the square? Account for the fact that the charge distribution gives rise to both a zero field and a zero potetial. Explain Thoroughly. A: ???