Magnetic fields: past paper questions

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• Question 6May/June 2026, paper 41Structured12 marksHas a diagram

  Define magnetic flux density.

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• Question 7Oct/Nov 2025, paper 41Structured11 marksHas a diagram

  State Faraday’s law of electromagnetic induction.

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• Question 1Oct/Nov 2024, paper 42Structured13 marksHas a diagram

  A metal wheel consists of an axle A, eight spokes and a rim, as shown in Fig. 1.1. Point X is on the rim at the end of one of the spokes. The rim has a radius of 0.85 m. The wheel is rotating clockwise with an angular speed of $140\text{ rad}{\text{ s}}^{-1}$.

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• Question 7May/June 2026, paper 42Structured8 marksHas a diagram

  A Hall probe consists of a slice of conducting material, as shown in Figure 7.1. Current $I$ enters the slice at face WXYZ and leaves it at face PQRS. The slice is in a uniform magnetic field of flux density $B$.

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• Question 5May/June 2024, paper 41Structured13 marksHas a diagram

  Define electric field.

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• Question 7Oct/Nov 2023, paper 42Structured11 marksHas a diagram

  A Hall probe containing a thin slice of semiconducting material is placed in a uniform magnetic field of flux density $B$. The largest faces of the slice are perpendicular to the magnetic field, as shown in Fig. 7.1. The thickness $x$ of the slice is $1.8\text{ mm}$.

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• Question 2May/June 2025, paper 42Structured12 marksHas a diagram

  State what is represented by a gravitational field line.

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• Question 6May/June 2023, paper 41Structured10 marksHas a diagram

  State what is meant by a magnetic field.

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• Question 6May/June 2023, paper 42Structured10 marksHas a diagram

  A heavy aluminium disc has a radius of $0.36\text{ m}$. The disc rotates with the wheels of a vehicle and forms part of an electromagnetic braking system on the vehicle.

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