Point Charges of Equal Magnitudes (25 NC) and Opposite Signs

Multiple Choice

Point charges of equal magnitudes (25 nC) and opposite signs are placed on (diagonally) opposite corners of a 60-cm *80-cm rectangle.If point A is the corner of this rectangle nearest the positive charge and point B is located at the intersection of the diagonals of the rectangle, determine the potential difference, VB - VA.

A) (-47 V)
B) +94 V
C) zero
D) (-94 V)
E) +47 V