Chapter 2: ELECTRIC POTENTIAL AND CAPACITANCE for AHSEC Class 12 Physics

Some probable questions from Chapter 2: Electric Potential and Capacitance for AHSEC Class 12 Physics, based on recent trends and previous years' papers:

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Short Answer Type (1-2 Marks)

1. Define electric potential at a point. What is its SI unit?
2. Define potential difference between two points.
3. Define electrostatic potential energy.
4. What is an equipotential surface? Give an example.
5. What is the relation between electric field and electric potential?
6. Can two equipotential surfaces intersect each other? Justify your answer.
7. Why is the electric field zero inside a conductor?
8. Write an expression for the capacitance of a parallel plate capacitor.
9. What is a dielectric constant? How does it affect the capacitance of a capacitor?
10. Define farad. How is it related to other units of capacitance?

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Short Derivation/Numerical Type (3-4 Marks)

11. Derive an expression for the electric potential at a point due to a point charge.
12. Derive an expression for the potential energy of a system of two point charges.
13. Derive an expression for the capacitance of a parallel plate capacitor with a dielectric medium.
14. What is a Van de Graaff generator? Explain its principle of operation.
15. Show that the work done in moving a charge between two points on an equipotential surface is zero.
16. Derive an expression for the energy stored in a charged capacitor.
17. A parallel plate capacitor has a plate area of 1m² and a plate separation of 1mm. If the dielectric medium between the plates is air, find its capacitance.
18. A capacitor of 5μF is charged to 10V. Calculate the energy stored in it.
19. A 20μF capacitor is connected in series with a 10μF capacitor. Find the equivalent capacitance.
20. Three capacitors of 4μF, 6μF, and 12μF are connected in parallel. Find the total capacitance.

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Long Answer Type (5-6 Marks)

21. Explain the concept of electric potential due to a point charge and derive its expression.
22. Derive the expression for the capacitance of a spherical capacitor.
23. What is a capacitor? Explain how capacitors are connected in series and parallel and derive their equivalent capacitance formulas.
24. Explain the principle and working of a Van de Graaff generator with a neat diagram.
25. Derive the expression for the energy density of an electric field in a capacitor.