Question

Where is the null point of unlike charge of different magnitude

Answer 1

Answer:

We are looking for the point where the force on a test charge, introduced near the 2 given charges, would be zero. At the null point, the attraction of the test charge toward one of the 2 given charges would be equal to the repulsion from the other given charge.

I will choose a one dimensional reference system with the - charge,

q

−

, at the origin (x=0), and the + charge,

q