Lesson 3.7.3.2

3.7.3.2 Electric field strength Quiz: AQA Physics, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.7.3.2, Electric field strength: 20 multiple choice questions for the AQA Physics (7408), Unit 7: Fields and their consequences (A-level only), written with Revision Ninja.

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The 20 questions

  1. Electric field strength at a point is defined as:

    • force per unit positive charge
    • charge per unit force
    • energy per unit charge
    • force multiplied by charge

  2. The field strength in a uniform field between parallel plates is:

    • E = V / d
    • E = V / d^2
    • E = V d
    • E = d / V

  3. The field strength between charged parallel plates is:

    • the pd divided by the plate separation
    • the pd multiplied by the plate separation
    • the pd divided by the square of the plate separation
    • the charge divided by the plate separation

  4. The field strength in a radial field at distance r from a point charge Q is:

    • E = Q / (4 pi eps0 r)
    • E = Q / (4 pi eps0 r^3)
    • E = 4 pi eps0 Q / r^2
    • E = Q / (4 pi eps0 r^2)

  5. Electric field lines point:

    • towards positive charges and away from negative charges
    • away from positive charges and towards negative charges
    • in closed loops around each charge
    • parallel to equipotential surfaces

  6. A charged particle enters a uniform electric field at right angles to the field. Its path is:

    • a circle of constant radius
    • a straight line
    • a helix
    • a parabola, like projectile motion

  7. The SI unit of electric field strength is:

    • V C^-1
    • N m C^-1
    • C m^-1
    • N C^-1, equivalent to V m^-1

  8. A charge of 3.0 microcoulomb experiences a force of 0.060 N in an electric field. What is the field strength?

    • 2.0 x 10^7 N C^-1
    • 1.8 x 10^-7 N C^-1
    • 2.0 x 10^-2 N C^-1
    • 2.0 x 10^4 N C^-1

  9. Two parallel plates 5.0 cm apart have a pd of 200 V across them. What is the uniform field strength?

    • 1.0 x 10^4 V m^-1
    • 4.0 x 10^3 V m^-1
    • 4.0 x 10^1 V m^-1
    • 4.0 x 10^5 V m^-1

  10. An electron is in a uniform field of strength 4.0 x 10^3 V m^-1. Estimate the force on the electron (e = 1.6 x 10^-19 C).

    • 6.4 x 10^-16 N
    • 6.4 x 10^-13 N
    • 6.4 x 10^-19 N
    • 2.5 x 10^-23 N

  11. The field strength at 2.0 m from a point charge of 4.0 microcoulomb is approximately:

    • 1.8 x 10^4 N C^-1
    • 9.0 x 10^3 N C^-1
    • 4.5 x 10^3 N C^-1
    • 9.0 x 10^4 N C^-1

  12. If the distance from a point charge is doubled, the electric field strength becomes:

    • one half
    • one quarter
    • twice
    • unchanged

  13. A proton (charge 1.6 x 10^-19 C, mass 1.67 x 10^-27 kg) is in a uniform field of 1000 N C^-1. What is its acceleration?

    • about 9.6 x 10^8 m s^-2
    • about 9.6 x 10^10 m s^-2
    • about 1.0 x 10^3 m s^-2
    • about 9.6 x 10^12 m s^-2

  14. Between two oppositely charged parallel plates, the field is:

    • zero between the plates and uniform outside them
    • radial between the plates and zero outside
    • uniform between the plates and approximately zero outside them
    • uniform everywhere

  15. Two equal and opposite point charges are placed apart. The direction of the field at the midpoint between them is:

    • from the positive charge towards the negative charge
    • zero, because the charges cancel
    • perpendicular to the line joining them
    • from the negative charge towards the positive charge

  16. A point is 3.0 m from a point charge, which gives field strength E. The field strength at 1.0 m from the same charge is:

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

  17. Charges +2.0 microcoulomb and -2.0 microcoulomb are 0.10 m apart. A point P is on the perpendicular bisector, 0.050 m from the midpoint. What is the magnitude of the field at P?

    • about 3.6 x 10^6 N C^-1
    • about 1.8 x 10^6 N C^-1
    • about 7.2 x 10^6 N C^-1
    • about 5.1 x 10^6 N C^-1

  18. An electron is in a uniform field of 500 N C^-1. Estimate its acceleration (e = 1.6 x 10^-19 C, m_e = 9.11 x 10^-31 kg).

    • about 1.6 x 10^-16 m s^-2
    • about 8.8 x 10^11 m s^-2
    • about 8.8 x 10^13 m s^-2
    • about 8.8 x 10^16 m s^-2

  19. A student says that electric field lines can cross each other. Which response is best?

    • Incorrect: field lines never cross, because at a crossing point the field would have two different directions.
    • Correct: lines cross wherever two charges meet.
    • Correct: field lines are arbitrary sketches, so they may cross.
    • Incorrect: lines cross only at the centre of a charge.

  20. An electron is accelerated across a 0.10 m region of uniform field of 2.0 x 10^3 V m^-1. What energy does it gain, in electronvolts?

    • 0.2 eV
    • 2000 eV
    • 200 eV
    • 20 eV

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