ElectrostaticsHard
Question
A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equlilibrium is q is equal to
Options
A.
B.
C.
D.
Solution
Since, q is at the centre of two charges Q and Q, net force on it is zero, whatever the magnitude and sign of charge on it.
For the equilibrium of Q, q should be negative because other charge Q will repel it. So q should attract it. Simultaneously these attractions and repulsions should be equal.
or
or with sign
∴ Correct option is (b).
For the equilibrium of Q, q should be negative because other charge Q will repel it. So q should attract it. Simultaneously these attractions and repulsions should be equal.
or
or with sign
∴ Correct option is (b).
Create a free account to view solution
View Solution FreeMore Electrostatics Questions
In a system of two dipoles placed in the way as shown in figure :...Figure shows a thick metallic sphere. If it is given a charge +Q, then electric field will be present in the region...A charge 3 coulomb experiences a force 300 N when placed in a uniform electric field. The potential difference between t...Electric field in a region is given by $\overrightarrow{E} = Ax\widehat{i} + By\widehat{j}$, where $A = 10\text{ }V/m^{2...An electric dipole is placed in an electric field generated by a point charge -...