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| Physics 10th Chapter 13 Electrostatics Questions Bank |
Physics 10th Chapter 13 Electrostatics Solved MCQs, Short and Long Questions
MCQs
Select the right Answer.
1. A capacitor is a perfect insulator for:
2. A region around the charge in which it exerts electrostatic force on another charge is called:
3. According to Coulomb’s law
4. An electron in a hydrogen atom experiences an electric intensity in the order of:
5. Electric charge of 100mC is 13 m apart from another charge 16.9mC. The force between them in Newton is:
6. Electric field 30 cm away from a light bulb is:
7. Electric field experienced by an electron of hydrogen atom from the nucleus is of the order of:
8. Electric field intensity is a vector quantity and its direction is:
9. Electric field is strong when liens are:
10. Electric potential is a:
11. Electron volt is the unit of:
12. Electroscope can be charge by the process:
13. Electroscope is an instrument used for:
14. Farad is defined as:
15. Force experienced by a unit positive charge placed at a point in the electric field is known as:
16. Force of attraction or repulsion acts between:
17. How much is the gravitational force which the Earth exerts on a billion kilogram object on the sea level?
18. If 4mF and 2mF capacitors are connected in series, the equivalent capacitance is given by:
19. If a potential of 220V is applied across a conductor and a current of 2A flows through it. What would be the resistance of the conductor?
20. If the distance between the two charged bodies is halved, the force between them becomes:
21. If the distance between two charges is doubled, the electric force between them will become:
22. In order to store the charge a device is used which is called:
23. K is constant of proportionality given by
24. One electron volt is equal to:
25. Parallel plate capacitor consist of two metal plates separated by:
26. SI unit of capacitance:
27. SI unit of electric field intensity is:
28. SI unit of electric intensity is:
29. SI unit of K is:
30. The capacitance C of a capacitor is given by the relation:
31. The electric force of repulsion between two electrons at a distance of 1 m is:
32. The electric intensity at infinite distance from the point charge is:
33. The electron energy is one electron – volt when it is accelerated through a potential difference of:
34. The equivalent capacitance is greater than individual capacitance in:
35. The force per unit charge is known as:
36. The magnitude of the charge on the electron is:
37. The potential difference between two points is one volt. The amount of work done in moving a charge of one coulomb from one point to another is:
38. The space around the charge within which other charges are influenced by it is called:
39. The spacing between the field lines shows the:
40. The value of Coulomb’s constant K depends upon:
41. The value of K is:
42. The work done in moving a unit positive charge form one point to another against the eclectic field is a measure of:
43. Tick the correct statement:
44. To detect the nearby objects, some animals produces:
45. Two 50mF capacitors are connected in parallel. The equivalent capacitance of the combination is:
46. Voltage across a device has the same meaning of:
47. We can calculate the amount of electricity bill by the following formula:
48. What is the electric field intensity 30 cm away from a light bulb?
49. What will be the electrostatic force between two charges each of one coulomb separated by 1m?
50. When capacitors are connected in parallel, their equivalent capacitance is equal to:
51. When capacitors are connected in series, their equivalent capacitance is equal to:
52. When Q coulomb of charge flows between the two points having potential difference of V volts then the energy in joules is represented by?
53. Which is incorrect for parallel capacitor?
54. Which one of the following is correct?
55. Which point in an electric field is equal to amount of work done in bringing unit positive charge from infinity to that point?
56. Which statement is true about electrical potential?
57. Who established fundamental law of electric force between two stationary charged particles?
58. Work done in bringing a unit positive charge from infinity to that point in an electric field is called:
Short Questions
1. A strong electric field exists in the vicinity of the “Faraday cage”. Yet the person inside the cage is not affected. Can you tell why?
2. An electrified rod attracts pieces of paper . After a while these pieces fly away! Why?
3. Are the electric field lines physical entities?
4. Capacitor blocks D.C. current but allows A.C. current to pass through a circuit. How does this happen?
5. Define electric field intensity?
6. Define potential difference between two points.
7. Defined farad.
8. Describe the method of charging bodies by electrostatic induction.
9. Discuss different types of capacitors.
10. Discuss one application of static electricity.
11. Does each capacitor carry equal charge in series combination? Explain.
12. Each capacitor in parallel combination has equal potential difference between its two plates. Justify the statement.
13. Enlist some uses of capacitors.
14. Explain why, a glass rod can be charged by rubbing when held by hand but an iron rod cannot be charged by rubbing, if held by hand?
15. How much negative charge has been removed from a positively charged electroscope, if it has a charge of 7.5 × 10⁻¹¹ C?
16. How capacitor store energy?
17. How does capacitor store charge?
18. How does electrostatic induction differ from charging by friction?
19. How electric charge is produced in bodies by friction?
20. How would you define potential difference between two points? Define its unit.
21. If a high-voltage power line fell across your car while you were in the car, why should you not come out of the car?
22. If two same charges are separated by 1 m distance having 9 × 10⁹ N. Then relate this force with gravitational force?
23. In what direction will a positively charged particle move in an electric field?
24. In what direction will a positively charged particle move in an electric field?
25. In which direction Coulomb’s force act between the two charges?
26. Is electric intensity a vector quantity? What will be its direction?
27. Is the equivalent capacitance of parallel capacitors larger or smaller than the capacitance of any individual capacitor in the combination?
28. Is the equivalent capacitance of series capacitors larger or smaller than the capacitance of any individual capacitor in the combination?
29. Is the presence of charge necessary for the existence of electrostatic potential?
30. On which factors the value of K depends?
31. Perhaps you have seen a gasoline truck trailing a metal chain beneath it. What purpose does the chain serve?
32. Show variation of magnitude of Coulomb force between two opposite charges of different magnitude?
33. State the Coulomb’s law.
34. Suppose two spheres are positively charged. If charge on one of the sphere is doubled then what will be the electrostatic force of attraction between them and what will be the nature of the force?
35. What is difference between variable and fixed type capacitor?
36. What is meant by electric field and electric intensity?
37. What are hazards of static electricity?
38. What are the applications of electrostatic induction?
39. What are the factors on which the capacitance of a capacitor depends?
40. What is direction of electric intensity?
41. What is electron volt? Also find its energy in joules.
42. What is meant by capacitance?
43. What is meant by electric potential?
44. What is meant by electrostatic induction, for which purpose it is used?
45. What is parallel combination of capacitor?
46. What is series combination of capacitor?
47. What is the difference between electric potential and electric potential energy?
48. What is the relation between equivalent capacitance of parallel combination and individual capacitance of each capacitor in this combination?
49. What is the relation between equivalent capacitance of series combination and individual capacitance of each capacitor in this combination?
50. What is the SI unit of charge?
51. What is the working principle of capacitor?
52. What will happen to Coulomb’s force, if the distance between two point charges becomes double?
53. Where electrostatic induction is used?
54. Why charge cannot be stored on capacitor for a long time?
55. With the help of electroscope how you can find presence of charge on a body.
Long Questions
1. How can you show by simple experiments that there are two types of electric charges?
2. What is gold leaf electroscope? Discuss its working principle with a labelled diagram.
3. Suppose you have a glass rod which becomes positively charged when you rub it with wool. Describe how would you charge the electroscope (i) negatively (ii) positively.
4. Describe how you would determine the nature of the charge on a body by using electroscope.
5. Explain Coulomb's law of electrostatics and write its mathematical form.
6. Show that potential difference can be described as energy transfer per unit charge between the two points.
7. What do you mean by the capacitance of a capacitor? Define units of capacitance.
8. Derive the formula for the equivalent capacitance for a series combination of a number of capacitors.
9. Define an electric charge. How electric charge can be produced?
10. Define electrostatic induction. Write the method of charging bodies by electrostatic induction?
11. Write in detail the construction and uses of electroscope?
12. How an electroscope be charged by electrostatic induction and conduction as well?
13. State coulomb's law. Derive the expression of electrostatic force
14. What is meant by electric field and electric intensity?
15. What are electric field lines? How field lines are related to the electric field intensity?
16. Define potential difference between two points. Show that potential difference can be described as energy transfer per unit charge between the two points.
17. Describe capacitor as an energy storing device. What do you mean by capacitance of a capacitor? Define units of capacitance.
18. Derive a formula for effective capacitance for parallel combination of a number of capacitors?
19. Derive a formula for effective capacitance for series combination of a number of capacitors?
20. Discuss different types of capacitors.
21. Write the uses of capacitors.
22. Discuss the applications of electrostatics
23. What are hazards of static electricity.
24. The charge of how many negatively charged particles would be equal to 100 µC. Assume charge on one negative particle is 1.6 × 10⁻¹⁹ C ?
25. Two point charges q1 = 10 µC and q2 = 5 µC are placed at a distance of 150 cm. What will be the Coulomb's force between them? Also find the direction of the force.
26. The force of repulsion between two identical positive charges is 0.8 N, when the charges are 0.1 m apart. Find the value of each charge.
27. Two charges repel each other with a force of 0.1 N when they are 5 cm apart. Find the forces between the same charges when they are 2 cm apart.
28. The electric potential at a point in an electric field is 10⁴ V. If a charge of +100 µC is brought from infinity to this point. What would be the amount of work done on it?
29. A point charge of +2 C is transferred from a point at potential 100 V to a point at potential 50 V. What would be the energy supplied by the charge?
30. A capacitor holds 0.06 coulombs of charge when fully charged by a 9 volt battery. Calculate capacitance of the capacitor .
31. A capacitor holds 0.03 coulombs of charge when fully charged by a 6 volt battery. How much voltage would be required for it to hold 2 coulombs of charge?
32. Two capacitors of capacitances 6 µF and 12 µF are connected in series with 12 V battery. Find the equivalent capacitance of the combination. Find the charge and the potential difference across each capacitor .
33. Two capacitors of capacitances 6 µF and 12 µF are connected in parallel with a 12 V battery. Find the equivalent capacitance of the combination. Find the charge and the potential difference across each capacitor .