Previous Year Questions

## Electrostatic Potential And Capacitance

- It's good to be already prepared. Go through the previous year questions
1
Work done in different equipotential regions
The diagrams below show regions of equipotentials.
A positive charge is moved from A to B in each diagram.
A
Maximum work is required to move in figure (b)
B
Maximum work is required to move in figure(c)
C
In all the cases the work done is the same.
D
Minimum work is required to move in figure(a)
2
Total electrostatic energy of a system of capacitors
A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system:
A
Increase by a factor of 2
B
Increase by a factor of 4
C
Decreases by a factor of 2
D
Remains the same
A capacitor is charged with a battery and the energy stored is . After disconnecting battery another capacitor of the same capacity is connected in parallel with it. Then the energy stored in each capacitor is :
A
B
C
D
3
Electrostatic force between the plates of a parallel plate capacitor.
The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is?
A
Proportional to the square root of the distance between the plates
B
Independent of the distance between the plates
C
Inversely proportional to the distance between the plates
D
Linearly proportional to the distance between the plates
4
Concept of conduction current and displacement current in capacitors.
A parallel plate capacitor of capacitance  is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively.
A
zero,
B
C
zero
D
zero , zero
5
Electric potential due to a dipole
A short electric dipole has a dipole moment of . The electric potential due to the dipole at a point at a distance of from the centre of the dipole, situated on a line making an angle of with the dipole axis is :
A
B
C
zero
D
6
Permittivity of the medium in a parallel plate capacitor
The capacitance of a parallel plate capacitor with air as medium is . With the introduction of a dielectric medium, the capacitance becomes . The permittivity of the medium is :

A
B
C
D
7
Relationship between Electric potential and Electric field
In a certain region of space with volume , the electric potential is found to be throughout. The magnitude of electric field in this region is :
A
B
C
D
zero
8
Torque acting on an electric dipole
A dipole of moment p is placed in uniform electric field E then torque acting on it is given by : -
A
B
C
D