ElectrostaticsHard
Question
Two equal positive charges are kept at points A and B. The electric potential, while moving from A to B along straight line :
Options
A.continuously increases
B.remains constant
C.decreases then increases
D.increases then decreases
Solution
Let the two charges at A & B are separated by distance 2 r.
Let us consider a general point ′M′ at distance
′x′ from point ′A′ in figure.
∴ Vm = Potential at M =
+ 
∴ Vm = kQ
= kQ
For Vm to be max. or min : Vm
= 0or
∴
= 0∴ x = r
& At x = r,
∴ x = r is min Hence potential continuously decreases from A to P and then increases
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