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
= 0
or   
∴   = 0
∴   x = r
&   At x = r,      ∴    x = r is min
Hence potential continuously decreases from A to P and then increases

Create a free account to view solution

View Solution Free
Topic: Electrostatics·Practice all Electrostatics questions

More Electrostatics Questions

A body can be negatively charged by:...ABC is a right angle triangle with right angle A and AB = AC = 30 cm if the charge on B and C is 4 × 10-3 μC t...The principle of quantization of charge proved by :...Which of the following is correct for given dig is the electric field uniformly working in + x direction....When charge is given to a soap bubble, it shows :...