Lesson 7.4.1

7.4.1 Magnetic flux density and forces on charges and currents Quiz: Pearson Edexcel Physics, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 7.4.1, Magnetic flux density and forces on charges and currents: 20 multiple choice questions for the Pearson Edexcel Physics (9PH0), Unit 7: Electric and Magnetic Fields, written with Revision Ninja.

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The 20 questions

  1. How is magnetic flux density defined for a perpendicular current-carrying conductor?

    • Flux per unit area
    • Force per unit current-length
    • Force per unit charge
    • Current per unit flux

  2. Which unit is equivalent to one tesla in terms of newtons, amperes, and metres?

    • N A^-1 m
    • N A m^-1
    • N A^-1 m^-1
    • J A^-1 m^-1

  3. In the magnetic force equation F = B I l sin(theta), what does theta represent?

    • Voltage-to-current angle
    • Wire-to-force angle
    • Wire-to-field angle
    • Field-to-force angle

  4. In Fleming's left-hand rule, what does the second finger represent?

    • Motion or force
    • Magnetic field
    • Electric charge
    • Conventional current

  5. Which equation gives the magnetic force on a charged particle of charge q and speed v moving in a magnetic field B?

    • F = B q / v
    • F = B q v / sin(theta)
    • F = B q^2 v
    • F = B q v sin(theta)

  6. Magnetic flux through a surface perpendicular to a magnetic field is the product of area and what?

    • Magnetic flux density
    • Magnetic force
    • Electric field strength
    • Current density

  7. What is flux linkage for a coil of N turns, each linked by magnetic flux phi?

    • N phi
    • N squared phi
    • phi / N
    • N + phi

  8. A wire of length 0.25 m carries a current of 4.0 A perpendicular to a uniform magnetic field of flux density 0.30 T. What is the force on the wire?

    • 0.075 N
    • 3.3 N
    • 1.2 N
    • 0.30 N

  9. A wire of length 0.40 m carries 5.0 A at 30 degrees to a uniform field of flux density 0.20 T. What is the force on the wire?

    • 0.17 N
    • 0.20 N
    • 0.35 N
    • 0.40 N

  10. An electron travels at 2.0 x 10^6 m s^-1 perpendicular to a magnetic field of flux density 0.010 T. What is the magnetic force on it?

    • 1.3 x 10^-15 N
    • 3.2 x 10^-15 N
    • 3.2 x 10^-13 N
    • 3.2 x 10^-17 N

  11. A proton moves parallel to the lines of a uniform magnetic field. What is the magnetic force on it?

    • Equal to qE
    • Equal to Bqv
    • Equal to Bq
    • Zero

  12. A flat surface of area 0.020 m^2 lies perpendicular to a uniform magnetic field of flux density 0.50 T. What is the magnetic flux through it?

    • 25 Wb
    • 0.010 Wb
    • 0.0040 Wb
    • 0.040 Wb

  13. A coil of 200 turns has the same magnetic flux of 0.010 Wb through each turn. What is its flux linkage?

    • 20 Wb
    • 0.050 Wb
    • 2.0 Wb
    • 0.010 Wb

  14. A wire carries current to the right in a magnetic field directed into the page. What is the force direction?

    • Upwards
    • Out of the page
    • Into the page
    • Downwards

  15. A wire of length 0.50 m carries 3.0 A at 60 degrees to a uniform field of flux density 0.40 T. What is the force on the wire?

    • 1.2 N
    • 0.26 N
    • 0.52 N
    • 0.60 N

  16. A flat coil of 50 turns and area 0.020 m^2 lies perpendicular to a uniform field of flux density 0.10 T. What is the flux linkage?

    • 0.010 Wb
    • 1.0 Wb
    • 0.40 Wb
    • 0.10 Wb

  17. An electron enters a magnetic field of flux density 0.20 T at 30 degrees to the field with speed 4.0 x 10^6 m s^-1. What is the magnetic force on it?

    • 6.4 x 10^-14 N
    • 3.2 x 10^-14 N
    • 1.3 x 10^-19 N
    • 1.3 x 10^-13 N

  18. Why does a magnetic field do no work on a moving charged particle?

    • Independent of velocity
    • Perpendicular to velocity
    • Parallel to velocity
    • Opposite to velocity

  19. What is the magnetic force on a stationary charged particle in a magnetic field?

    • Zero
    • Equal to charge
    • Dependent on field
    • Maximum force

  20. Using F = BIl instead of F = BIl sin θ for a wire at an angle gives what error?

    • Overestimating force
    • Zero force
    • No error
    • Underestimating force

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