An electric charge `10^(-3)mu C` is placed at the origin (0,0) of x-y coordinate system. Two points A and B are situated at `(sqrt2, sqrt2)` and (2,0) respectively. The potential difference between the points A and B will be

Options

A. zero
B. 9V
C. 4.5 V
D. 2V

Answer

A

Explanation

Here distance of point `A [ sqrt 2, sqrt 2]` from charge point `[0,0] = 2` and distance of point B[2,0] from charge point [0,0] is also 2.
`:. V_A = V_B = q/(4 pi epsi_0.r)` and hence `V_A - V_B = 0`