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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. What is the potential energy at the center of an equilateral triangle if +5esu, +5esu and -10esu are placed at the corners of the triangle? The triangle has a side length of √3cm.
2. 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.
3. 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?
4. Find the true statement.
5. 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.
6. 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.
7. When 'n' capacitors are connected in series the total capacitance(C) of the combination is given by ______
8. 1 electron volt= __________ J.
9. Find the equivalent capacitance of the combination shown below.
10. Which is the expression for electric potential due to a system of charges from the following?
11. When was Van de Graff generator invented and by whom?
12. A parallel plate capacitor has a plate area of 100 cm2 and is separated by a distance of 20 mm. Find its capacitance.
13. 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?
14. If a charged body is moved in an electric field against the Coulomb force, then ________
15. Electric potential due to a point charge q at a distance r from the point is _______ (in the air).
16. Identify the factor on which the capacitance of a parallel plate capacitor does not depend.
17. 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?
18. What is the induced dipole moment developed per unit volume of a dielectric when placed in an external electric field called?
19. What is the ratio of the polarization to εo times the electric field called?
20. Which of the following is an example of a molecule whose centre of mass of positive and negative charges coincide each other?
21. Identify the dimension of electrostatic potential energy from the following.
22. A charge q is placed at the center of a circle and B, C are the points on the circle. Another charge q is moved from A to B and from A to C. Which of them is correct?
23. Pick out the expression of electric potential energy from the following.
24. 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?
25. What is the dimension of the dipole moment?

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