Capacitance, capacitors and energy stored - Question Bank
1. What is the work done to move a charge q from infinity to a point where the potential is V?
2. If the distance between the plates of a parallel plate capacitor is halved, while keeping the charge constant, the potential difference between the plates will:
3. The energy stored in a capacitor can also be expressed as:
4. A 1 µF capacitor is charged to 100 V. The charge stored on the capacitor is:
5. Which of the following statements is true for capacitors in series?
6. Which of the following statements is true for capacitors in parallel?
7. What is the unit of dielectric constant?
8. A capacitor of 1 µF is charged to 10 V. If the voltage is increased to 20 V, the energy stored increases by a factor of:
9. The ability of a dielectric material to reduce the electric field between the plates of a capacitor is measured by its:
10. When a dielectric material is inserted between the plates of a charged capacitor (disconnected from the source), the capacitance:
11. What is the capacitance of a capacitor if it stores 0.001 C of charge when the potential difference across it is 100 V?
12. If two capacitors C1 and C2 are connected in parallel and charged by a voltage V, the charge on C1 is given by:
13. If two capacitors C1 and C2 are connected in series and charged by a voltage V, the voltage across C1 is given by:
14. Electrolytic capacitors are polarized and must be connected with the correct polarity. This is because:
15. The maximum charge a capacitor can hold without breakdown is determined by its:
16. What is the potential difference across a 5 µF capacitor storing 10 mJ of energy?
17. A variable capacitor is used in tuning circuits because its capacitance can be:
18. The capacitance of a parallel plate capacitor filled with a dielectric material is 10 µF. If the dielectric is removed, the capacitance will:
19. What is the capacitance of a capacitor with a charge of 6 µC and a potential difference of 3 V?
20. If a capacitor is charged and then discharged, the energy stored is dissipated as:
21. The unit of energy stored in a capacitor is:
22. In a parallel plate capacitor, if the permittivity of the dielectric material is ε, the capacitance is given by C = εA/d. If a vacuum is replaced by a material with dielectric constant k, the capacitance becomes:
23. A capacitor with capacitance C is charged to a voltage V. If the voltage is increased to 2V, the stored energy becomes:
24. Which type of capacitor is suitable for high-frequency applications and has a stable capacitance value?
25. The capacitance of a capacitor is defined as the ratio of the charge on one of its conductors to the:
26. When a dielectric is inserted into a charged capacitor disconnected from the battery, the electric field between the plates:
27. What is the maximum energy that can be stored in a 100 µF capacitor rated for 10 V?
28. Two capacitors, 2µF and 4µF, are connected in parallel. What is the equivalent capacitance?
29. Two capacitors, 2µF and 4µF, are connected in series. What is the equivalent capacitance?
30. What is the effect of increasing the thickness of the dielectric between the plates of a parallel plate capacitor, assuming the dielectric constant remains the same?
31. A capacitor is essentially a device to increase the electrical energy storage capacity of a circuit by:
32. The energy density in the electric field between the plates of a parallel plate capacitor is given by:
33. If a capacitor is charged by a battery and remains connected, and the plates are moved farther apart, the charge on the capacitor will:
34. If a capacitor is charged by a battery and then disconnected, and the plates are moved farther apart, the potential difference across the capacitor will:
35. Dielectric strength is the maximum electric field a dielectric material can withstand without:
36. What is the unit of charge?
37. The capacitance of a spherical capacitor of radius R is proportional to:
38. Which of the following is NOT a type of capacitor?
39. A capacitor of 10 µF is charged to 100 V. The energy stored in the capacitor is:
40. When capacitors are connected in parallel, the total capacitance is:
41. Two capacitors C1 and C2 are connected in series. The equivalent capacitance Ceq is given by:
42. If the voltage across a capacitor is doubled, the energy stored in it will:
43. The energy stored in a capacitor is given by the formula:
44. If a capacitor has a capacitance of 1 Farad and is charged to a potential difference of 1 Volt, how much charge does it store?
45. The dielectric constant of a material is always:
46. What happens to the capacitance of a parallel plate capacitor if a dielectric material is introduced between the plates?
47. If the area of the plates of a parallel plate capacitor is doubled, its capacitance will:
48. The capacitance of a parallel plate capacitor is given by C = ε₀A/d, where A is the area of the plates and d is the distance between them. If the distance between the plates is doubled, the capacitance will:
49. A capacitor is a device used to store:
50. What is the unit of capacitance in the SI system?