Electric charge and Coulomb’s law - Question Bank

1. If the charges are removed from an object, the object becomes:
A) Positively charged
B) Negatively charged
C) Neutral
D) Electrically unstable
2. 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
3. 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
4. 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
5. Coulomb's law is valid for:
A) Point charges only
B) Spherical charges
C) Any distribution of charge
D) Moving charges
6. 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
7. 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
8. 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
9. 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
10. 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
11. 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
12. 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
13. 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
14. The unit of electric charge in the CGS system is:
A) Coulomb
B) Ampere
C) Statcoulomb (esu)
D) Farad
15. 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
16. When a neutral object gains electrons, its net charge becomes:
A) Positive
B) Negative
C) Zero
D) Indeterminate
17. Which of the following is NOT a fundamental property of electric charge?
A) Quantization
B) Conservation
C) Polarization
D) Additivity
18. 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
19. 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
20. 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
21. 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
22. 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]
23. Which of the following quantities is conserved in an isolated system?
A) Electric potential
B) Electric field
C) Electric charge
D) Electric current
24. 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
25. 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
26. 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.
27. 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
28. If the distance between two point charges is doubled, the force between them becomes:
A) Double
B) Half
C) One-fourth
D) Four times
29. 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
30. 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.
31. 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
32. 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
33. 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)
34. 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
35. 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
36. 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
37. 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.
38. 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.
39. 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
40. 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
41. 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
42. 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
43. 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
44. 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
45. 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
46. 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
47. Coulomb's law describes the force between two:
A) Magnets
B) Stationary electric charges
C) Moving electric charges
D) Gravitational masses
48. 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
49. Which fundamental particle carries a negative elementary charge?
A) Proton
B) Neutron
C) Electron
D) Positron
50. What is the SI unit of electric charge?
A) Ampere
B) Volt
C) Coulomb
D) Ohm
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