Lesson 6.2.2

6.2.2 Coulomb's law Quiz: OCR Physics, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.2.2, Coulomb's law: 20 multiple choice questions for the OCR Physics (H156), Unit 5: Particles and medical physics, written with Revision Ninja.

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The 20 questions

  1. What is the SI unit of electric field strength?

    • N m⁻¹
    • N C⁻¹
    • N C
    • J C⁻¹

  2. How is a uniformly charged sphere modelled for electric field calculations outside its surface?

    • Ring of charge
    • Point charge at centre
    • Uniform line charge
    • Dipole at surface

  3. Which law describes the electrostatic force between two point charges?

    • Ampere's law
    • Newton's law
    • Faraday's law
    • Coulomb's law

  4. What happens to the electrostatic force between two charges if distance is doubled?

    • Halved
    • Quartered
    • Quadrupled
    • Doubled

  5. Which property allows electric fields to repel, unlike gravitational fields?

    • Field line density
    • Inverse square decay
    • Two charge types
    • Permittivity constant

  6. What physical constant does the symbol epsilon_0 represent in Coulomb equations?

    • Permittivity of free space
    • Permeability of free space
    • Stefan constant
    • Planck constant

  7. What is the defining equation for electric field strength E?

    • E = F q
    • E = F q²
    • E = F / q
    • E = F / r

  8. Field lines around an isolated positive point charge point in which direction?

    • Parallel lines
    • Concentric circles
    • Radially outwards
    • Radially inwards

  9. Two 1 C charges are separated by 1 m in space. What is the approximate force between them?

    • 9 × 10¹² N
    • 9 × 10⁹ N
    • 9 × 10³ N
    • 9 × 10⁻⁹ N

  10. A charge of 2 C experiences a force of 10 N in a field. What is the field strength?

    • 12 N C⁻¹
    • 5 N C⁻¹
    • 20 N C⁻¹
    • 0.2 N C⁻¹

  11. How does electric field strength E vary with distance r from a point charge?

    • Proportional to 1/r²
    • Proportional to r
    • Proportional to 1/r
    • Proportional to r²

  12. Which relationship is shared by both Newton's law of gravitation and Coulomb's law?

    • Inverse-square law
    • Mass dependence
    • Attractive forces only
    • Permittivity dependence

  13. A point charge Q produces field strength E at distance r. What is field strength at distance 3r?

    • 3 E
    • E / 9
    • E / 6
    • E / 3

  14. What magnitude and direction of electrostatic force acts on a charge minus q in field E?

    • E over q
    • Zero force
    • qE along field
    • qE opposite field

  15. If both point charges are doubled at a constant distance, how does force change?

    • Remains constant
    • Increases fourfold
    • Increases eightfold
    • Doubles

  16. Which field can exert a force on a stationary neutral mass?

    • Electric field
    • Neither field
    • Gravitational field
    • Magnetic field

  17. What is the base SI unit for permittivity of free space, ε₀?

    • N m² C⁻²
    • F m⁻¹
    • J C⁻¹
    • C m⁻¹

  18. What is the approximate value of the constant 1 / (4π ε₀)?

    • 9.0 × 10⁹ N m² C⁻²
    • 8.85 × 10⁻¹² F m⁻¹
    • 1.6 × 10⁻¹⁹ C
    • 6.67 × 10⁻¹¹ N m² kg⁻²

  19. Two positive charges repel with force F. If one charge becomes negative, what is the force?

    • -F
    • 2F
    • Zero
    • F / 2

  20. What physical quantity is represented by the area under a force-distance graph for a point charge?

    • Work done
    • Total charge
    • Electric field strength
    • Potential gradient

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