General Physics II — 2026-test Past Questions

University of Ilorin PHY102: 44 questions.

Topics: Coulomb's law and superposition, Electric field and potential, Electric charge and its properties, Energy in electric fields

  1. Which of the following is true about subatomic particles?
    1. Electrons are made up of quarks
    2. Neutrons are electrically neutral particles
    3. Protons and neutrons are positively charged
    4. Electrons are positively charged
  2. The mass of an atom is concentrated mainly in the
    1. Valence shell
    2. Electron cloud
    3. Nucleus
    4. Orbitals
  3. Which force holds the protons and neutrons of the nucleus together?
    1. Weak nuclear force
    2. Strong nuclear force
    3. Electromagnetic force
    4. Gravitational force
  4. An atom becomes positively charged when it
    1. Accepts an electron
    2. Loses an electron
    3. Gains a neutron
    4. Loses a proton
  5. Which of the following correctly describes quarks?
    1. They are found in electrons
    2. They are found in protons and neutrons
    3. They carry no charge
    4. They are found in the electron cloud
  6. An object has a net charge of −4.8 µC. How many excess electrons does it have? (e = 1.6 × 10⁻¹⁹ C)
    1. 7.68 × 10⁻²³
    2. 3.0 × 10¹⁴
    3. 3.0 × 10¹³
    4. 3.0 × 10¹⁹
  7. How many electrons are contained in a charge of 70 µC? (e = 1.6 × 10⁻¹⁹ C)
    1. 4.375 × 10¹⁴
    2. 1.12 × 10⁻²⁴
    3. 7.0 × 10¹³
    4. 4.375 × 10¹³
  8. A neutral body can be made to attract a charged body through
    1. Induction
    2. Magnetism only
    3. Friction only
    4. Gravitation
  9. Why does a comb attract small pieces of paper after being rubbed?
    1. Nuclear force acts
    2. Polarization
    3. Mass changes
    4. Gravitational force changes
  10. What is the expression for the electrostatic force exerted on a charge q by another charge Q separated by a distance r?
    1. KqQ/r²
    2. KqQ/r³
    3. Kq/r²
    4. KQ/r²
  11. Which of the following does NOT affect the electrostatic force between two charges?
    1. Mass of the charges
    2. Quantity of charge
    3. Medium
    4. Separation between the charges
  12. The forces described in Coulomb's law
    1. Attract and repel each other depending on sign
    2. Depend on the masses of the charges
    3. Only attract each other
    4. Only repel each other
  13. If two charges of equal magnitude are both doubled and the distance between them is also doubled, the electrostatic force becomes
    1. F/4
    2. F/2
    3. F
    4. 2F
  14. If the distance between two charges is reduced to one-third of its original value, the new electrostatic force becomes
    1. F/9
    2. 3F
    3. 9F
    4. F/3
  15. If the distance between two charges is multiplied by a factor of 3, what happens to the force?
    1. It becomes 9F
    2. It becomes F/9
    3. It becomes 6F
    4. It becomes F/6
  16. If the distance between two equal charges q is reduced to 3/4 of its original value r, the new Coulomb force in terms of r is
    1. (9q²/16) × (1/4πε₀r²)
    2. 5q³/6πr²
    3. (16q²/9) × (1/4πε₀r²)
    4. 6q²/4πε₀
  17. Two charges exert a force of 5 N on each other. What will be the new force if the distance between them is halved?
    1. 20 N
    2. 40 N
    3. 10 N
    4. 30 N
  18. Two equal charges exert a force of 0.9 N when separated by 1 m. What will be the force when the distance becomes 2 m?
    1. 0.45 N
    2. 0.18 N
    3. 0.225 N
    4. 2 N
  19. An electric force of 4 N exists at a distance of 0.3 m. Find the new force at a distance of 0.6 m.
    1. 4 N
    2. 1 N
    3. 3 N
    4. 2 N
  20. Calculate the electrostatic force between two point charges of +25 µC and −20 µC if they are placed at an infinite distance from one another.
    1. Zero
    2. 100 N
    3. 1 N
    4. 10 N
  21. Two charges of 2 µC and 3 µC are 0.3 m apart. Find the force between them. (K = 9 × 10⁹ N m²/C²)
    1. 0.452 N
    2. 0.216 N
    3. 0.600 N
    4. 0.056 N
  22. Calculate the distance between two charges of −2 × 10⁻⁶ C and 3 × 10⁻⁶ C if the magnitude of their force of attraction is 15 N. (K = 8.99 × 10⁹ N m²/C²)
    1. 5 cm
    2. 3 cm
    3. 7.5 cm
    4. 6 cm
  23. What is the distance between an 800 nC and a 900 nC charge if the force between them is 15 N? (K = 9 × 10⁹ N m²/C²)
    1. 4.97 cm
    2. 2.078 cm
    3. 2.80 cm
    4. 1.89 cm
  24. Two equal charges of 1 µC each exert a force of 9 N on each other. What is the distance between them? (K = 9 × 10⁹ N m²/C²)
    1. 0.0316 m
    2. 0.44 m
    3. 0.97 m
    4. 1 m
  25. A charge of +4 µC is placed at x = 0 and a charge of +9 µC is placed at x = 1 m. At what point must a third positive charge be placed so that the resultant force on it is zero?
    1. 0.40 m
    2. 0.67 m
    3. 0.60 m
    4. 0.50 m
  26. What is the expression for a quarter of the force between two charges separated by a distance x?
    1. (1/4πε₀) × q₁q₂/x²
    2. (1/16πε₀) × q₁q₂/x²
    3. (1/4πε₀) × q₁²q₂/x²
    4. (1/4πε₀) × q₁q₂/2x²
  27. The dielectric constant of a material is
    1. More than 1
    2. Less than 1
    3. Equal to 1
    4. Equal to 0
  28. Which of the following does NOT depend on a test charge?
    1. Momentum
    2. Acceleration
    3. Electric field
    4. Electric force
  29. Which of the following is WRONG about an electric field?
    1. A positive charge is dimensionless
    2. A positive test charge moves away from a positive source charge
    3. A negative charge moves towards a positive charge
    4. A negative charge moves away from a negative charge
  30. If a charged body placed in an electric field moves in the direction opposite to the field, the charge of the body is
    1. Positive
    2. Negative
    3. Neutral
    4. Zero
  31. The electric field intensity at a distance r from a point charge is E. What is the electric field intensity at a distance 2r from the same charge?
    1. E/4
    2. E/2
    3. E
    4. 2E
  32. Find the electric field intensity at 0.3 m from a charge of 2 µC. (K = 9 × 10⁹ N m²/C²)
    1. 4 × 10⁵ N/C
    2. 2 × 10⁵ N/C
    3. 1 × 10⁵ N/C
    4. 6 × 10⁵ N/C
  33. Calculate the electric field when a 4 µC charge is placed at a distance of 2 m. (K = 9 × 10⁹ N m²/C²)
    1. 9.0 × 10³ N/C
    2. 4.5 × 10³ N/C
    3. 1.8 × 10⁴ N/C
    4. 3.6 × 10³ N/C
  34. If a charge Q produces an electric field and a test charge q is placed in it, the expression for the electric field E is
    1. F/Q
    2. F/q
    3. q/F
    4. Q/F
  35. Two equal but opposite charges of magnitude 5 µC are separated by a distance of 10 cm. What is the resultant electric field at point R, which lies on the line through the charges, 5 cm from the positive charge on the side away from the negative charge? (K = 9 × 10⁹ N m²/C²)
    1. 52 × 10⁶ N/C
    2. 43 × 10⁶ N/C
    3. 16 × 10⁶ N/C
    4. 25 × 10⁶ N/C
  36. An electron is placed in a uniform electric field of magnitude 2.0 × 10⁴ N/C directed to the right. What is the magnitude of the electric force acting on the electron? (e = 1.6 × 10⁻¹⁹ C)
    1. 3.2 × 10⁻¹⁵ N
    2. 1.6 × 10⁻¹⁵ N
    3. 6.4 × 10⁻¹⁵ N
    4. 3.2 × 10⁻¹⁴ N
  37. A small test charge experiences a force of 0.05 N when placed in an electric field of strength 5.0 × 10⁵ N/C. What is the magnitude of the test charge?
    1. 1.0 × 10⁻⁷ C
    2. 2.5 × 10⁻⁷ C
    3. 1.0 × 10⁻⁶ C
    4. 2.5 × 10⁻⁸ C
  38. A proton and an electron placed in the same electric field experience the same
    1. Force
    2. Mass
    3. Acceleration
    4. Magnitude of charge
  39. A proton (mass = 1.67 × 10⁻²⁷ kg, charge = 1.6 × 10⁻¹⁹ C) is placed in an electric field of 500 N/C. What is the magnitude of its acceleration?
    1. 2.1 × 10¹¹ m/s²
    2. 4.8 × 10¹⁰ m/s²
    3. 3.0 × 10⁻¹¹ m/s²
    4. 8.0 × 10⁻¹⁷ m/s²
  40. Two point charges q₁ = +2 µC and q₂ = −4 µC are separated by a distance of 0.30 m in a vacuum. What is the magnitude of the electrostatic force? (K = 9 × 10⁹ N m²/C²)
    1. 0.452 N
    2. 0.800 N
    3. 0.216 N
    4. 0.108 N
  41. A +10 µC charge Q₁ is placed 25 cm from a −20 µC charge. If the charge Q₁ is tripled, what is its new value?
    1. 3Q₁
    2. 5Q₁
    3. 6Q₁
    4. 2Q₁
  42. The SI unit of electric potential is
    1. N/C
    2. J/C
    3. C/N
    4. C/J
  43. When two unlike charges are brought close to each other, what happens to their potential energy?
    1. Increases
    2. Remains the same
    3. Decreases
    4. Becomes zero
  44. If two unit charges (1 C each) are separated by 1 m, what is the magnitude of the force between them? (K = 9 × 10⁹ N m²/C²)
    1. 9 × 10⁹ N
    2. 9 × 10⁶ N
    3. 9 × 10³ N
    4. 9 N

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