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Class 12 Physics: Electrostatic Potential and Capacitance
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MCQs on electrostatic potential, potential due to point charge and electric dipole, equipotential surfaces, potential energy in external field, conductors electrostatics, dielectrics, polarisation, capacitors, capacitance, parallel plate capacitor, dielectric capacitance effects, capacitors combination and van de graff generator.

Class 12 Physics: Electrostatic Potential and Capacitance
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25 Questions

1. Two plates are kept at a distance of 0.1m and their potential difference is 20V. An electron is kept at rest on the surface of the plate with lower potential. What will be the velocity of the electron when it strikes another plate?
2. Which of the following statements is correct?
3. Find the true statement.
4. Find out the correct expression of the capacitance of a parallel plate capacitor where 'A' is the area of the plates, 'd' is the distance between the plates and 'ε0'is the permittivity of the medium.
5. Pick out the expression for energy stored in a capacitor from the following.
6. Calculate the capacitance of the capacitor, if 1012 electrons are transferred from one conductor to another of a capacitor and a potential difference of 10 V develops between the two conductors.
7. What is the total charge on the parallel plate capacitor shown?
8. Which of the following is an example of a molecule whose centre of mass of positive and negative charges coincide each other?
9. If VA and VVB are the potentials of the two points A and B, what will be the correct relation between the electric field and the potential difference between the points? The distance between the points is d.
10. Electric field intensity and electric potential at a certain distance from a point charge is 32 N/C and 16 J/C. What is the distance from the charge?
11. What is the value of capacitance of a capacitor if it has a charge of 9C and voltage of 5V?
12. By performing a set of experiments, a scientist found that the electric field between two points A and B is zero. What can he conclude regarding the potential of the two points?
13. What is the equivalent capacitance when the 2 capacitors are connected in series?
14. Electric potential due to a point charge q at a distance r from the point is _______ (in the air).
15. How is the electric field at the surface of a charged conductor related to the surface charge density?
16. What is the ratio of the polarization to εo times the electric field called?
17. Three capacitors are connected in the shape of a triangle ABC as shown below. A voltage of 4V is applied between B and C. Calculate the voltage between A and C.
18. Identify the dimension of electrostatic potential energy from the following.
19. Electric potential varies with distance such that V(x) =ax-bx3; where a and b are constants. Where will the electric field intensity be zero?
20. Find the equivalent capacitance of the combination shown below.
21. Initially the potential difference of a 8 μF capacitor is 30 V. Then it is changed to 40 V. What is the increase in energy?
22. 'X' is a substance which does not allow the flow of charges through it but permits them to exert electrostatic forces on one another through it. Identify X.
23. Which one is the correct expression of electric potential on the axial point of a dipole whose dipole moment is p and length is 2l, at a distance of r?
24. If A and B are two equipotential surfaces around a positive point charge q, what will happen if we place another point charge +Q between A and B?
25. A parallel plate capacitor has a plate area of 100 cm2 and is separated by a distance of 20 mm. Find its capacitance.

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