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Quiz: Electric Charges and Fields Online Test (Progressive Test)
Total questions: 472
Questions in this round: 50
Time allotted: 60 minutes
Pass score: 5%
Total rounds: 10
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Quiz: Electric Charges and Fields Online Test (Certificate Challenge)
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Time allotted: 100 minutes
Certificate pass score: 5%
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Class 12 Physics: Electric Charges and Fields Online Test

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1 / 50

1. A closed surface encloses no charge, but a charge is placed outside it. Which statement is correct?

a) The electric field on the surface must be zero everywhere

b) The net flux must be positive because the external charge produces field

c) Gauss's law is invalid because the charge is outside

d) The net electric flux through the closed surface is zero

2 / 50

2. A small charged body has charge . At its location, the electric field is . What is the magnitude of force on the body?

3 / 50

3. Which statement about flux through an open surface and a closed surface is correct?

a) An open surface always has zero flux

b) Closed uses outward normals; open uses chosen normals

c) Area vectors are tangential for both open and closed surfaces

d) A closed surface cannot have negative flux through any part of it

4 / 50

4. A point charge is at the centre of a spherical Gaussian surface. If the radius of the surface is doubled, which quantity remains unchanged and which quantity becomes one-fourth?

a) Both total flux and field magnitude remain unchanged

b) Flux stays unchanged; field on the surface becomes one-fourth

c) Both total flux and field magnitude become one-fourth

d) Field magnitude remains unchanged; total flux becomes one-fourth

5 / 50

5. Which condition allows to be taken outside the flux integral ?

a) The enclosed charge must be negative

b) The Gaussian surface must be open

c) must be zero everywhere on the surface

d) Same on that surface part

6 / 50

6. Which relation correctly connects force and electric field for a charge placed in an electric field ?

7 / 50

7. If the test charge used at a point is changed from to , while the source charges remain undisturbed, what happens to the electric field at that point?

a) It stays the same

b) It becomes double

c) It becomes zero

d) It becomes half

8 / 50

8. Which Gaussian surface is most suitable for finding the field due to an isolated point charge?

a) A pillbox with the charge on one flat face

b) A cylinder with the charge on its curved surface

c) An arbitrary open surface

d) A sphere centred on the point charge

9 / 50

9. Use the arrangement described below.

A charge is placed at point O. A charge is placed at a distance on the positive -axis from O, and another charge is placed at a distance on the positive -axis from O.

What is the direction of the net force on at O?

a) Along -direction

b) Along the bisector between and

c) Along the bisector between and

d) Along -direction

10 / 50

10. Which statement best explains the discontinuity of electric field at the surface of a charged thin spherical shell?

a) The field is discontinuous because Gauss's law fails at the surface

b) The field changes from just inside to just outside because charge disappears outside

c) It jumps from just inside to just outside because charge is on the surface

d) The field must be continuous for every charge distribution

11 / 50

11. Which statement correctly describes electrostatic shielding by a conductor?

a) Shielding happens because conductors have no mobile charges

b) A conductor increases the electric field inside itself

c) It can make the electric field inside its material zero

d) Shielding means all external charges are destroyed

12 / 50

12. An electron is placed between two oppositely charged infinite sheets. The electric field is directed from the positive sheet to the negative sheet. What is the direction of force on the electron?

a) Parallel to the sheets

b) Zero because the electron is very small

c) From negative sheet to positive sheet

d) From positive sheet to negative sheet

13 / 50

13. A charge is placed at the midpoint between a charge on the left and a charge on the right, both at equal distances. What is the direction of the net force on ?

a) Zero

b) Toward the right

c) Toward the left

d) Perpendicular to the line joining the charges

14 / 50

14. The Coulomb constant is related to the permittivity of free space by which expression?

15 / 50

15. A dipole is placed in a uniform electric field with . Which statement is correct?

a) It is unstable with maximum potential energy

b) It experiences non-zero net force but zero torque

c) It is in stable equilibrium with minimum potential energy

d) It experiences maximum torque

16 / 50

16. In charging by conduction, a charged body is brought into contact with a neutral conductor. What is the main charge-transfer feature of this method?

a) Charge is transferred without any contact or conducting path

b) Only polarisation occurs and no charge can ever move

c) Charge is transferred through direct contact

d) The neutral conductor must always become oppositely charged to the charging body

17 / 50

17. Which statement correctly compares the electric field just inside and just outside a positively charged thin spherical shell?

a) Just inside field is larger than just outside field

b) Just outside field is tangential to the shell

c) Zero inside; non-zero outward outside

d) Just inside and just outside fields are both zero

18 / 50

18. Which statement about charge conservation during charging is correct?

a) Charging transfers or redistributes charge while total charge is conserved

b) Contact charging creates charge only on the initially neutral body

c) Friction creates positive charge and destroys negative charge

d) Induction violates charge conservation because charging happens without contact

19 / 50

19. In the Gauss-law derivation of the field due to an infinitely long uniformly charged wire, which expression represents the total flux through the curved surface of a coaxial cylinder of radius and length ?

20 / 50

20. A uniformly charged solid sphere has field at its surface. What is the field at inside the sphere?

21 / 50

21. A plane surface has area . A uniform electric field of makes an angle with the area vector. What is the electric flux?

22 / 50

22. Which graph description is correct for electric field magnitude due to a fixed positive point charge as distance from the charge increases?

a) decreases as only

b) decreases as

c) increases linearly with

d) is constant for all

23 / 50

23. A charge is placed at . Another charge is placed at . Which vector expression correctly gives the force on due to , if is along ?

24 / 50

24. A dipole with moment is placed in a uniform field . What is its potential energy when ?

25 / 50

25. A circular surface of radius is placed in a uniform electric field . The area vector is in the same direction as the field. What is the flux through the surface? Use .

26 / 50

26. A charge is placed at the centre of a square. Four identical charges are placed at the four corners of the square. What is the net force on the central charge?

a) Perpendicular to the plane of the square

b) Zero

c) Along one side of the square

d) Toward one corner

27 / 50

27. Which statement is incorrect for an electric dipole in a non-uniform electric field?

a) The local field at the two charges must be considered separately

b) The dipole may experience rotational motion

c) The forces on and must always be equal in magnitude

d) The dipole may experience translational motion

28 / 50

28. A dipole is placed in a non-uniform field, with its negative end closer to the region of stronger field and its positive end farther away. Which point must be checked before deciding the direction of the net force?

a) Only the sign of the total charge

b) The local at each end of the dipole

c) Only the value of

d) Only whether the dipole is electrically neutral

29 / 50

29. An infinite plane sheet has . A second infinite plane sheet with is placed parallel to it. What is the magnitude of the electric field in the region between the sheets?

30 / 50

30. A uniformly charged thin spherical shell has radius . Which graph description correctly represents versus , where is the distance from the centre?

a) for , then for

b) is constant for all

c) for , then for

d) for , then for

31 / 50

31. A uniformly charged solid sphere and a uniformly charged thin spherical shell have the same total charge and radius . Which comparison is correct at ?

a) The shell field is zero, while the solid-sphere field is non-zero

b) Both fields are zero

c) The solid-sphere field is zero, while the shell field is non-zero

d) Both fields are equal to

32 / 50

32. Which row correctly matches the source with the graph shape of versus ?

Row	Source	Graph of versus
P	Point charge	Decreases as
Q	Infinite line charge	Decreases as
R	Infinite plane sheet	Horizontal line
S	Far dipole field	Decreases as

a) P, Q, R and S

b) Q, R and S only

c) P and S only

d) P, Q and R only

33 / 50

33. Which statement best distinguishes a conductor from an insulator?

a) A conductor always has positive charge, while an insulator always has negative charge

b) A conductor can have electric charge, while an insulator can never have electric charge

c) A conductor allows charge redistribution, while an insulator restricts it

d) A conductor attracts charges, while an insulator repels all charges

34 / 50

34. Use the arrangement described below.

Four identical positive charges are placed at the four corners of a square. Point O is the centre of the square.

What is the net electric field at O?

a) Along one diagonal

b) Zero

c) Perpendicular to the plane of the square

d) Along one side of the square

35 / 50

35. Which row correctly connects the sign of charge placed in a fixed electric field with the direction of force on it?

Row	Charge placed in field	Direction of force
P		Same as
Q		Same as
R		Opposite to
S		Zero for every non-zero

a) Row P only

b) Rows Q and S only

c) Row Q only

d) Rows P and R only

36 / 50

36. A cube of side is placed in a uniform electric field directed along . What is the net flux through the closed cube?

37 / 50

37. Two fixed point charges and are separated by a distance . What is the direction of the electric field at the midpoint between them?

a) Perpendicular to the line joining the charges

b) From toward

c) Zero because the charge magnitudes are equal

d) From toward

38 / 50

38. Which row correctly compares a uniformly charged thin spherical shell and a uniformly charged solid sphere?

Row	Distribution	Inside field for
P	Thin spherical shell
Q	Uniform solid sphere
R	Thin spherical shell
S	Uniform solid sphere

Which rows are correct?

a) Q and R only

b) P and Q only

c) R and S only

d) P and S only

39 / 50

39. On the equatorial line of an electric dipole, the direction of the electric field is:

a) Opposite to

b) Perpendicular to at every point

c) Zero at every point

d) Along

40 / 50

40. Two identical conducting spheres have charges and . They are touched together and then separated. What is the charge on each sphere after separation?

a) on each sphere

b) on each sphere

c) on each sphere

d) on each sphere

41 / 50

41. Use the arrangement described below.

Two equal and opposite charges and are placed at and , respectively. Point P is on the perpendicular bisector above the midpoint.

What is the direction of the net electric field at P?

a) Along -direction

b) Along -direction

c) Along -direction

d) Zero because the charges have equal magnitude

42 / 50

42. A graph of electric field magnitude versus distance from a single infinite uniformly charged plane sheet is best described as:

a) A straight line through the origin with positive slope

b) A decreasing curve

c) A decreasing curve

d) A horizontal straight line

43 / 50

43. A field magnitude becomes half when the distance from the source is doubled. Which ideal source is most consistent with this behaviour?

a) Point charge

b) Infinite line charge

c) Far electric dipole

d) Infinite plane sheet

44 / 50

44. A graph is plotted between electric field magnitude due to an infinitely long uniformly charged wire and . What does the slope represent?

45 / 50

45. Between two oppositely charged infinite plane sheets, the direction of electric field is:

a) From the negative sheet to the positive sheet

b) From the positive sheet to the negative sheet

c) Parallel to both sheets

d) Zero everywhere between the sheets

46 / 50

46. For a negatively charged infinite plane sheet, the electric field on either side is:

a) Directed toward the sheet

b) Directed away from the sheet

c) Parallel to the sheet

d) Zero everywhere

47 / 50

47. Which expression correctly states Gauss's law?

48 / 50

48. A charge is placed at the origin. A charge is placed at , and a charge is placed at . What is the magnitude of the net force on the charge at the origin? Take .

49 / 50

49. Match the type of charge distribution with its correct charge density symbol and unit.

Column I	Column II
P. Linear charge density	1. , unit
Q. Surface charge density	2. , unit
R. Volume charge density	3. , unit

a) P-2, Q-1, R-3

b) P-1, Q-3, R-2

c) P-3, Q-2, R-1

d) P-2, Q-3, R-1

50 / 50

50. A uniformly charged thin spherical shell has surface charge density and radius . What is its total charge?

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