Two point charges of +40x10^-6C and -60x10^-6 are placed 50 cm apart. What is the distance from +40x10^-6 charge along the line joining the two point charges if the resultant potential is zero..

Question

Can you give me the exact formula to do this question and explain more on it.. Thank you..

Answer 1

potentials add
Q1/r = Q2/(.5-r)