JEE Main - Electric charge and Coulomb’s law Online Test (MCQ Quiz)

1. What is the SI unit of electric charge?

A) Ampere B) Volt C) Coulomb D) Ohm

2. Which fundamental particle carries a negative elementary charge?

A) Proton B) Neutron C) Electron D) Positron

3. What is the charge of a proton?

A) -1.6 x 10^-19 C B) +1.6 x 10^-19 C C) Zero D) 3.2 x 10^-19 C

4. Coulomb's law describes the force between two:

A) Magnets B) Stationary electric charges C) Moving electric charges D) Gravitational masses

5. The force between two point charges is directly proportional to:

A) The sum of the charges B) The product of the charges C) The square of the distance between them D) The inverse square of the distance between them

6. The force between two point charges is inversely proportional to:

A) The product of the charges B) The sum of the charges C) The square of the distance between them D) The square root of the distance between them

7. Coulomb's law can be expressed mathematically as F = k * |q1*q2| / r^2, where k is:

A) The distance between charges B) The product of the charges C) Coulomb's constant D) The permittivity of free space

8. The value of Coulomb's constant (k) in vacuum is approximately:

A) 9 x 10^9 N m^2/C^2 B) 8.85 x 10^-12 N m^2/C^2 C) 1.6 x 10^-19 C D) 6.67 x 10^-11 N m^2/kg^2

9. The permittivity of free space (ε₀) is related to Coulomb's constant (k) by:

A) k = 1 / (4πε₀) B) k = 4πε₀ C) k = ε₀ / 4π D) k = 4π / ε₀

10. If two identical positive charges are brought closer together, the electrostatic force between them will:

A) Decrease B) Increase C) Remain the same D) Become attractive

11. If a positive charge and a negative charge are brought closer together, the electrostatic force between them will:

A) Decrease B) Increase C) Become repulsive D) Become zero

12. The principle of superposition for electric forces states that:

A) The total force on a charge is the sum of forces due to all other charges. B) The force between two charges is independent of other charges present. C) Electric forces add vectorially. D) All of the above

13. Which of the following is a consequence of charge quantization?

A) Charge can only exist in discrete multiples of the elementary charge. B) Charge is always conserved. C) Like charges repel, and unlike charges attract. D) The total charge of an isolated system remains constant.

14. Which of the following is a consequence of charge conservation?

A) Charge can be created or destroyed. B) The net electric charge of an isolated system is constant. C) Charge exists only in discrete units. D) The force between charges depends on the medium.

15. When a substance is rubbed with another, triboelectric effect causes:

A) Transfer of charge B) Generation of heat C) Change in mass D) Emission of light

16. If a charge of +2μC and a charge of -3μC are separated by 1 meter in vacuum, what is the approximate magnitude of the force between them?

A) 5.4 x 10^-3 N B) 1.8 x 10^-3 N C) 6.0 x 10^-3 N D) 9.0 x 10^-3 N

17. Two identical metallic spheres, each with charge +Q, are separated by a distance r. If they are brought into contact and then separated to the same distance r, the force between them will:

A) Increase B) Decrease C) Remain the same D) Become zero

18. The force between two point charges q1 and q2 separated by distance r in a medium of dielectric constant K is given by:

A) F = (1/4πε₀) * (q1*q2 / r^2) B) F = (1/4πε₀K) * (q1*q2 / r^2) C) F = (K/4πε₀) * (q1*q2 / r^2) D) F = (4πε₀K) * (q1*q2 / r^2)

19. A dielectric constant (K) for a medium is always:

A) Less than 1 B) Equal to 1 C) Greater than or equal to 1 D) Zero

20. The force between two charges in a vacuum is 10 N. If the same charges are placed in a medium with a dielectric constant of 2, the force becomes:

A) 20 N B) 10 N C) 5 N D) 2.5 N

21. Which of the following statements about electric charge is INCORRECT?

A) Charge is a scalar quantity. B) Charge is quantized. C) Charge is not conserved. D) Charge is additive.

22. The charge on a body is -3.2 μC. This means the body has:

A) An excess of 3.2 x 10^-6 electrons B) A deficit of 3.2 x 10^-6 electrons C) An excess of 2 x 10^13 electrons D) A deficit of 2 x 10^13 electrons

23. If the distance between two point charges is doubled, the force between them becomes:

A) Double B) Half C) One-fourth D) Four times

24. Coulomb's law is analogous to Newton's law of gravitation in that:

A) Both forces are attractive. B) Both forces depend on the product of the quantities involved. C) Both forces are inversely proportional to the square of the distance. D) All of the above

25. Which of the following is a property of electric charge?

A) It is a vector quantity. B) It is quantized. C) It can be created or destroyed. D) Its magnitude depends on the medium.

26. The force between two charges of +1 C each, separated by 1 meter in vacuum, is:

A) 9 x 10^9 N B) 1 N C) Zero D) 1 / (9 x 10^9) N

27. When a glass rod is rubbed with silk, the rod becomes positively charged because:

A) It gains electrons B) It loses electrons C) It gains protons D) It loses protons

28. Which of the following quantities is conserved in an isolated system?

A) Electric potential B) Electric field C) Electric charge D) Electric current

29. What is the dimension of electric charge?

A) [M L T A] B) [A T] C) [M L^3 T^-3 A^-1] D) [M L^2 T A]

30. If the charge on an object is doubled, the electrostatic force between it and another fixed charge:

A) Remains the same B) Is halved C) Is doubled D) Becomes four times

31. In Coulomb's law, the constant 'k' is dependent on:

A) The magnitude of the charges B) The distance between the charges C) The nature of the medium between the charges D) The sign of the charges

32. If the distance between two point charges is reduced to half, the force between them increases by a factor of:

A) 2 B) 4 C) 1/2 D) 1/4

33. The force between two charges is 12 N. If both charges are tripled, the force becomes:

A) 36 N B) 108 N C) 12 N D) 4 N

34. Which of the following is NOT a fundamental property of electric charge?

A) Quantization B) Conservation C) Polarization D) Additivity

35. When a neutral object gains electrons, its net charge becomes:

A) Positive B) Negative C) Zero D) Indeterminate

36. What is the force experienced by a charge q1 due to another charge q2?

A) F = k * q1 / r^2 B) F = k * q2 / r^2 C) F = k * |q1*q2| / r^2 D) F = k * (q1+q2) / r^2

37. The unit of electric charge in the CGS system is:

A) Coulomb B) Ampere C) Statcoulomb (esu) D) Farad

38. If the medium between two charges is changed from vacuum to a dielectric medium with dielectric constant K > 1, the force between the charges:

A) Increases B) Decreases C) Remains the same D) Becomes zero

39. Two charges are placed at a certain distance apart. If a dielectric slab is inserted between them, the force between them will:

A) Increase B) Decrease C) Remain unchanged D) Become zero

40. Which of the following is the smallest unit of charge that can exist independently?

A) 1 Coulomb B) 1 electron charge C) 1 proton charge D) 1 atomic unit of charge

41. When is the electrostatic force between two charges maximum?

A) When they are in a vacuum B) When they are in water C) When they are in air D) When they are in a metal

42. The force between two charges is repulsive. What can be said about the charges?

A) Both are positive B) Both are negative C) One is positive and one is negative D) Both A and B

43. What is the value of the elementary charge, e?

A) 1.6 x 10^-19 C B) -1.6 x 10^-19 C C) 9.11 x 10^-31 kg D) 6.022 x 10^23 mol^-1

44. The force between two charges is attractive. What can be said about the charges?

A) Both are positive B) Both are negative C) One is positive and one is negative D) They are neutral

45. If a body has a charge of -1.6 C, how many excess electrons does it have?

A) 10^19 B) 10^18 C) 10^17 D) 10^16

46. Coulomb's law is valid for:

A) Point charges only B) Spherical charges C) Any distribution of charge D) Moving charges

47. The force between two charges is F. If the charges are placed in a medium with dielectric constant K, the new force will be:

A) F * K B) F / K C) F + K D) F - K

48. Which of the following statements regarding electric charge is correct?

A) Charge is always created in pairs. B) Charge can be created from energy. C) Charge is always associated with mass. D) All of the above

49. What is the mass of an electron?

A) 9.11 x 10^-31 kg B) 1.67 x 10^-27 kg C) 6.67 x 10^-11 kg D) Zero kg

50. If the charges are removed from an object, the object becomes:

A) Positively charged B) Negatively charged C) Neutral D) Electrically unstable

Electric charge and Coulomb’s law - Online Test

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