Point charges of equal magnitudes $(25nC)$ 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, $V_B-V_A.$

Select one:

a$.$

$+94V$

b$.$

$-94V$

c$.$

$-47$ V

d$.$

zero

e$.$