Electrostatics chapter notes and video lectures with all ETEA test MCQs explanation by Shamsul Amin
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Chap No.10 ELECTROSTATICS
1. 1 e = 1.602 x 10-11 C
2. Charge is quantized → q=ne
3. Coulomb measure force between electric charges using an apparatusCalled torsion balance
4. The constant k depends upon units used andMedium between charges
5. For like charges the product q1q2 will be positive and force of repulsion will be F21
6. For unlike charges the product q1q2 will be negative and force of repulsion will be F12
7. F21 =-F12
8. The permittivity of material medium compared with vacuum permittivity is called Relative permittivity or Dielectric constant
9. Fmed < Fvac
10. SI units of electric field intensity are NC-1 or Vm-1
11. The strength of electric field is proportional to the magnitude of Source charge
12. The direction of resultant intensity is Tangent to the field
13. At some points resultant intensity is zero which is called Neutral points
14. The fields such as ends of plates are called Fringing field
15. Field lines starting from charge are always Perpendicular to the surface
16. The electric field lines cannot pass through a Conductor
17. In inside a conductor, electic field is Zero
18. The concept of field theory was introduced by Michal Faraday
19. The existence of electric field can be proved by bringing a Test charge (qo)
20. A single vector quantity that contains information about field strength and direction is Electric field intensity
21. Intensity of an electric field at any point is the force per unit Charge
22. Electric field strength is a Vector quantity
23. The SI unit of electric field intensity is N C-1 or V m1
24. Heart of photocopier is drum, made of aluminum and coated with Selenium
25. The strength of the electric field is proportional to the Magnitude of the source charge
26. The electric field in vicinity of charge is represented by imaginary lines called Electric lines of force
27. The direction of electric field lines for positive charge is radially Outward
28. The direction of electric field lines for negative charge is radially inward
29. The resultant intensity is the sum of intensities due to positive and negative charge and their direction is along the Tangent to the field
30. The points where resultant intensity are zero these points are called Neutral points
31. The field ate the end of plates which bulging out are Fringing field
32. Electric field lines of forces on metal are always Perpendicular to the metal surface
33. The electric field lines of force cannot pass through the Conductor
34. A photocopier is a machine that makes quickly and easily Copies of documents
35. In photocopier the aluminum cylinder coated with a layer of Selenium
36. Last, the paper and adhering toner pass through Heated pressure rollers
37. The dry copying process is based on electrostatics
38. Aluminum is an excellent electrical conductor while selenium is Photoconductor
39. Electrode of photocopier is called Corotron
40. Dark areas in the photocopier retain their Positive charge
41. Dry black colour powder in the photocopier is called Toner
42. To transfer the toner into, the paper is given the Positive charge
43. Laser printer works due the process called Xerography
44. In laser printer the drum is charged by Corona wire
45. The area which are not exposed to light make up the Printed image
46. In its operation the inkjet paper uses Electric charges
47. In inkjet printers, not to be inked area ,the charging control is Turned on
48. The electric field due to a charge sphere has Spherical symmetry
49. Number of lines of force that pass through area placed in electric field Electric flux (φ= EA cos θ )
50. The unit of electric flux is N m2 C-1
For more key points , read our BOM Series Physics book.
Chap No.10 ELECTROSTATICS
1. 1 e = 1.602 x 10-11 C
2. Charge is quantized → q=ne
3. Coulomb measure force between electric charges using an apparatusCalled torsion balance
4. The constant k depends upon units used andMedium between charges
5. For like charges the product q1q2 will be positive and force of repulsion will be F21
6. For unlike charges the product q1q2 will be negative and force of repulsion will be F12
7. F21 =-F12
8. The permittivity of material medium compared with vacuum permittivity is called Relative permittivity or Dielectric constant
9. Fmed < Fvac
10. SI units of electric field intensity are NC-1 or Vm-1
11. The strength of electric field is proportional to the magnitude of Source charge
12. The direction of resultant intensity is Tangent to the field
13. At some points resultant intensity is zero which is called Neutral points
14. The fields such as ends of plates are called Fringing field
15. Field lines starting from charge are always Perpendicular to the surface
16. The electric field lines cannot pass through a Conductor
17. In inside a conductor, electic field is Zero
18. The concept of field theory was introduced by Michal Faraday
19. The existence of electric field can be proved by bringing a Test charge (qo)
20. A single vector quantity that contains information about field strength and direction is Electric field intensity
21. Intensity of an electric field at any point is the force per unit Charge
22. Electric field strength is a Vector quantity
23. The SI unit of electric field intensity is N C-1 or V m1
24. Heart of photocopier is drum, made of aluminum and coated with Selenium
25. The strength of the electric field is proportional to the Magnitude of the source charge
26. The electric field in vicinity of charge is represented by imaginary lines called Electric lines of force
27. The direction of electric field lines for positive charge is radially Outward
28. The direction of electric field lines for negative charge is radially inward
29. The resultant intensity is the sum of intensities due to positive and negative charge and their direction is along the Tangent to the field
30. The points where resultant intensity are zero these points are called Neutral points
31. The field ate the end of plates which bulging out are Fringing field
32. Electric field lines of forces on metal are always Perpendicular to the metal surface
33. The electric field lines of force cannot pass through the Conductor
34. A photocopier is a machine that makes quickly and easily Copies of documents
35. In photocopier the aluminum cylinder coated with a layer of Selenium
36. Last, the paper and adhering toner pass through Heated pressure rollers
37. The dry copying process is based on electrostatics
38. Aluminum is an excellent electrical conductor while selenium is Photoconductor
39. Electrode of photocopier is called Corotron
40. Dark areas in the photocopier retain their Positive charge
41. Dry black colour powder in the photocopier is called Toner
42. To transfer the toner into, the paper is given the Positive charge
43. Laser printer works due the process called Xerography
44. In laser printer the drum is charged by Corona wire
45. The area which are not exposed to light make up the Printed image
46. In its operation the inkjet paper uses Electric charges
47. In inkjet printers, not to be inked area ,the charging control is Turned on
48. The electric field due to a charge sphere has Spherical symmetry
49. Number of lines of force that pass through area placed in electric field Electric flux (φ= EA cos θ )
50. The unit of electric flux is N m2 C-1
For more key points , read our BOM Series Physics book.
