Lesson 3.7.5.3

3.7.5.3 Magnetic flux and flux linkage Quiz: AQA Physics, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.7.5.3, Magnetic flux and flux linkage: 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. Magnetic flux through a flat area A in a uniform field B, with B normal to the area, is given by which expression?

    • BA
    • B + A
    • B^2 A
    • B/A

  2. What is the SI unit used to measure magnetic flux?

    • Tesla
    • Henry
    • Farad
    • Weber

  3. What is the flux linkage of a coil of N turns, each turn having flux Phi passing through it?

    • N^2 Phi
    • Phi/N
    • N Phi
    • N + Phi

  4. A coil of 200 turns has area 5.0 cm^2 in a field of 0.040 T normal to its plane. What is its flux linkage?

    • 2.0 x 10^-5 Wb
    • 4.0 x 10^-3 Wb
    • 1.0 x 10^-3 Wb
    • 4.0 x 10^-2 Wb

  5. A coil of 100 turns and area 0.010 m^2 is in a field of 0.20 T, with the coil normal at 60 degrees to the field. What is its flux linkage?

    • 0.10 Wb
    • 0.20 Wb
    • 0.0 Wb
    • 0.017 Wb

  6. What is the magnetic flux linkage through a coil when its plane is parallel to the field?

    • Zero
    • Maximum
    • Half of maximum
    • BAN

  7. A coil of 50 turns and area 0.020 m^2 in a field of 0.30 T rotates from normal alignment to a position with its plane parallel to the field. What is the change in flux linkage?

    • 0.15 Wb
    • 0.30 Wb
    • 0.60 Wb
    • 0.0 Wb

  8. Which trigonometric function describes magnetic flux linkage as a coil's angle with the field normal varies?

    • Exponential
    • Cosine
    • Sine
    • Tangent

  9. In the definition of magnetic flux, how must the area be oriented to the field?

    • At 60 degrees
    • Parallel
    • At 45 degrees
    • Perpendicular

  10. A flat loop of area 0.10 m^2 is normal to a uniform field of 0.50 T. What is the flux through it?

    • 0.0050 Wb
    • 5.0 Wb
    • 0.20 Wb
    • 0.050 Wb

  11. A 500-turn coil of area 0.0020 m^2 lies in a field of 0.080 T with its normal along the field. What is the maximum flux linkage?

    • 0.080 Wb
    • 0.80 Wb
    • 0.16 Wb
    • 0.00080 Wb

  12. Two identical coils of areas and field orientation the same have 100 and 200 turns. What is the ratio of their flux linkages?

    • 2:1
    • 1:1
    • 1:4
    • 1:2

  13. A coil of area 0.040 m^2 is in a field of 0.20 T. The normal to the coil is 30 degrees from the field. What is the flux through the coil?

    • 3.5 x 10^-3 Wb
    • 8.0 x 10^-3 Wb
    • 6.9 x 10^-3 Wb
    • 4.0 x 10^-3 Wb

  14. What physical quantity is calculated by multiplying the number of coil turns by magnetic flux?

    • Flux linkage
    • Flux density
    • Induced voltage
    • Field strength

  15. A coil of 300 turns and area 6.0 cm^2 lies normal to a field of 0.25 T. What is its flux linkage?

    • 0.045 Wb
    • 0.18 Wb
    • 0.45 Wb
    • 0.0045 Wb

  16. A coil's flux linkage is measured for the same flux through each turn. What happens to flux linkage when the number of turns is doubled?

    • It quadruples
    • It is unchanged
    • It doubles
    • It halves

  17. How does magnetic flux linkage through a rotating coil vary with angle θ to the normal?

    • Proportional to cos θ
    • Proportional to θ
    • Proportional to sin θ
    • Inversely to cos θ

  18. A coil of 2 turns, each of area 0.010 m^2, lies in a field of 0.40 T with its normal at 60 degrees to the field. What is its flux linkage?

    • 1.6 x 10^-2 Wb
    • 4.0 x 10^-3 Wb
    • 2.0 x 10^-3 Wb
    • 8.0 x 10^-3 Wb

  19. The flux through a 10-turn loop changes from 0.12 Wb to 0.02 Wb. What is the change in flux linkage?

    • -1.0 Wb
    • +1.0 Wb
    • -0.10 Wb
    • -0.010 Wb

  20. A coil has flux linkage 0.30 Wb with its normal along the field. What is the flux linkage when its normal is at 60 degrees to the field?

    • 0.52 Wb
    • 0.30 Wb
    • 0.15 Wb
    • 0.26 Wb

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