Four charges are placed on the corners of a rectangle with
length d = 0.00341 mm and breadth s = 0.00119 mm, as shown in the
figure. The charges are given in terms of the elementary charge, e
= +1.602×10‒19 C, as follows: q1 = q2 = +2000e and q3 = q4 =
‒3000e.
(a) Calculate the electric potential at point A, the middle of
the rectangle, and at point B, the middle of the right-hand side of
the rectangle....