10. Three point-like charges of equal magnitudes are going to be placed at the corners of the square shown in the figure. Which one of these is correct if the charge at corner (B) is positive, the charge at corner (D) is positive, and the charge at corner (C) is positive? A B The total electric field at the center of the square points toward the (C) corner The total electric field at the center of the square points toward the (D) corner The total electric field at the center of the square points toward the (A) corner The total electric field at the center of the square points toward the (B) corner The total electric field at the center of the square is zero