Electrostatic Potential and Capacitance – Solutions
1) Two charges 5×10-8 C and -3 x 10-8 C are located 16 cm apart. At what point on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
According to the problem:
q1 = 5 x 10-8 C, (first charge)
q2 = -3 x 10-8 C (second charge)
Let r1 = x meter, (x = distance of null point from 1st charge)
r2 = (0.16 –x) meter (Distance of point from 2nd charge)
According to the question the potential at the point on the line joining two charges is zero.
V1 + V2 = 0 (where, V1 = potential due to first charge, V2 = potential due to second charge)