Q. 44.5( 4 Votes )

Two equal positive charges are kept at points A and B. The electric potential at the points between A and B (excluding these points) is studied while moving from A to B. The potential
A. continuously increases

B. continuously decreases

C. increases then decreases

D. decrease then increases

Answer :

Potential due to a point charge at a distance r is given by:




Therefore, at a point very nearby to A and B, r 0 V


i.e.


At a very nearby point right to A and a very nearby point left to B, potential will tend to ∞ (maximum possible value) as separation will tend to zero. That means at a point somewhere in the middle of path AB, the potential will acquire its minimum value.


Therefore, while moving from A to B, potential will first decrease and then increase.

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