plumiMagnetic flux density: AQA A‑Level Physics questions
AQA A-Level Physics past-paper questions on 3.7.5.1 Magnetic flux density, 2008–2025, with mark schemes and examiner’s reports where available.
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All 44 questions on Magnetic flux density, as a list
- June 2025, Paper 2, Q20 (1 mark): A horizontal wire is perpendicular to a horizontal uniform magnetic field of flux density B. The wire has length L and diameter d. The current in the wire is I.
- June 2024, Paper 3A, Q03.1 (3 marks): Describe a method to show that the copper rod is horizontal. Your method must include the use of a metre ruler. You may annotate Figure 10. [3 marks]
- June 2024, Paper 3A, Q03.2 (3 marks): When the switch is open, the reading on the balance shows the mass of the yoke and the two magnets. When the switch is closed, the reading on the balance decrea
- June 2024, Paper 3A, Q03.4 (3 marks): Determine Y. [3 marks] Y = g
- June 2024, Paper 3A, Q03.5 (3 marks): A student sets up the apparatus with the copper rod positioned incorrectly. Figure 14 shows how the student’s arrangement compares with the correct arrangement.
- June 2023, Paper 2, Q20 (1 mark): A wire is at right angles to a uniform magnetic field and carries an electric current. The wire is 150 mm in length. When the current in the wire is increased b
- June 2023, Paper 3A, Q03.2 (2 marks): Determine the percentage change in BH produced by this rotation of the coil. Show your working. [2 marks] percentage change = %
- June 2023, Paper 3A, Q03.4 (2 marks): During experiment 1, BH is measured with the sensor at Q. The sensor is then moved along PR until the value of BH is halved. The distance from Q to the sensor i
- June 2023, Paper 3A, Q03.5 (2 marks): Deduce, in mT, the value of BH in this region. [2 marks] BH = mT
- June 2023, Paper 3A, Q03.6 (2 marks): State two characteristics of the magnetic field lines in this region. [2 marks] 1 2
- June 2023, Paper 3A, Q03.7 (3 marks): In experiment 4, the current in coil 2 is reversed so that the direction of the magnetic field produced by coil 2 is also reversed. The magnitudes of the curren
- June 2022, Paper 2, Q22 (1 mark): A horizontal wire of length 0.25 m carrying a current of 3.0 A is perpendicular to a magnetic field. The mass of the wire is 3.0 × 10−3 kg and the weight of the
- November 2021, Paper 2, Q21 (1 mark): A short copper rod R is placed on a pair of thick horizontal parallel copper rails. A horizontal magnetic field exists in the direction shown by the dashed arro
- November 2020, Paper 2, Q23 (1 mark): The diagram shows a current I in a vertical square coil. The coil can rotate about an axis OO’. The plane of the coil is at right angles to a uniform horizontal
- June 2019, Paper 2, Q23 (1 mark): The plane of coil PQRS is parallel to a uniform magnetic field. When a current I is in the coil [1 mark] A there are no magnetic forces acting on SP and QR. B t
- June 2019, Paper 2, Q24 (1 mark): A horizontal wire of length 0.50 m and weight 1.0 N is placed in a uniform horizontal magnetic field of flux density 1.5 T directed at 90° to the wire. What is
- June 2018, Paper 2, Q27 (1 mark): The diagram shows a clockwise current I in a circular coil placed in a uniform magnetic field B with the plane of the coil perpendicular to the magnetic field.
- June 2018, Paper 3A, Q01.2 (3 marks): The student attaches a uniform wire to the upper edge of the ruler, as shown in Figure 3. The ends of the wire are connected to terminal blocks P and Q which ar
- June 2018, Paper 3A, Q01.3 (3 marks): It can be shown that B, the magnitude of the magnetic flux density of the horizontal uniform magnetic field, is given by 3 B L = where = change in force acting
- June 2018, Paper 3A, Q01.4 (3 marks): The experiment is repeated with the ruler pivoted at the 99.0 cm mark. Nothing else is changed from Figure 3. This arrangement is shown in Figure 5. Figure 5 Ti
- June 2018, Paper 3A, Q01.5 (2 marks): Figure 6 shows the balance being used to measure the forces between two wires. The connections joining these wires to the power supply are not shown. The pan of
- June 2018, Paper 3A, Q01.6 (5 marks): The vertical force F on wire X due to the magnetic field produced by wire Y is given by 2 kI L F d = where and k is a constant d is the perpendicular distance b
- June 2017, Paper 2, Q02.1 (1 mark): Which of the following correctly describes the direction of the force acting on the wire DE due to the magnetic field when the switch is closed? Tick () the co
- June 2017, Paper 2, Q02.2 (1 mark): Label the poles of the magnets by putting N or S on each of the two dashed lines in Figure 3. [1 mark]
- June 2017, Paper 2, Q02.3 (1 mark): Define the tesla. [1 mark]
- June 2017, Paper 2, Q02.4 (2 marks): The magnets are 5.00 cm long. When the current in the wire is 3.43 A the reading on the electronic balance is 0.620 g. Assume the field is uniform and is zero b
- Specimen, Paper 2, Q18 (1 mark): A horizontal straight wire of length 0.30 m carries a current of 2.0 A perpendicular to a horizontal uniform magnetic field of flux density 5.0 × 10−2 T. The wi
- June 2016, PHYA4 Section A (old spec), Q21 (1 mark): The diagram shows a horizontal conductor of length 50 mm carrying a current of 3.0 A at right angles to a uniform horizontal magnetic field of flux density 0.50
- June 2015, PHYA4 Section A (old spec), Q20 (1 mark): The diagram shows a rigidly-clamped straight horizontal current-carrying wire held mid-way between the poles of a magnet on a top-pan balance. The wire is perpe
- June 2015, PHYA4 Section A (old spec), Q21 (1 mark): Four rectangular loops of wire A, B, C and D are each placed in a uniform magnetic field of the same flux density B. The direction of the magnetic field is para
- June 2014, PHYA4 Section B (old spec), Q2(b)(i) (2 marks): State the direction of the magnetic force that acts on the moving electrons in the wire as a consequence of the current and explain how you arrive at your answe
- June 2013, PHYA4 Section A (old spec), Q23 (1 mark): The diagram shows a vertical square coil whose plane is at right angles to a horizontal uniform magnetic field B. A current, I, is passed through the coil, whic
- January 2013, PHYA4 Section A (old spec), Q20 (1 mark): A horizontal straight wire of length 40mm is in an east-west direction as shown in the diagram. A uniform magnetic field of flux density 50mT is directed downwa
- June 2012, PHYA4 Section A (old spec), Q20 (1 mark): A section of current-carrying wire is placed at right angles to a uniform magnetic field of flux density B. When the current in the wire is I, the magnetic forc
- January 2012, PHYA4 Section A (old spec), Q20 (1 mark): A horizontal straight wire of length 0.30m carries a current of 2.0A perpendicular to a horizontal uniform magnetic field of flux density 5.0 × 10–2T. The wire
- January 2011, PHYA4 Section B (old spec), Q5(a)(i) (1 mark): State the direction of the force on the wire when there is a direct current from P to Q, as shown in Figure 5. (1 mark)
- January 2011, PHYA4 Section B (old spec), Q5(a)(ii) (3 marks): In a second experiment, an alternating current is passed through the wire. Explain why the wire will vibrate vertically.
- January 2011, PHYA4 Section B (old spec), Q5(b) (3 marks): The permanent magnet produces a uniform magnetic field of flux density 220mT over a 55mm length of the wire. Show that the maximum force on the wire is about 40
- June 2010, PHYA4 Section A (old spec), Q19 (1 mark): The diagram shows a rigidly-clamped straight horizontal current-carrying wire held mid-way between the poles of a magnet on a top pan balance. The wire is perpe
- June 2010, PHYA4 Section A (old spec), Q22 (1 mark): Which one of the following could not be used as a unit of force? A AT m B W s–2 C kgms–2 D J m–1
- January 2010, PHYA4 Section A (old spec), Q21 (1 mark): A current of 8.0A is passed through a conductor of length 0.40m and cross-sectional area 1.0 × 10–6m2. The conductor contains 8.0 × 1028 free electrons per m3.
- June 2008, PA04B (2008 spec), Q4(a) (2 marks): 4 (a) A horizontal wire is placed in the centre of the magnetic field and aligned to make it perpendicular to the flux lines. When a current is passed through t
- June 2008, PA10 (2008 spec), Q1(b) (5 marks): 1 (b) (i) Braking of the car is assisted by a generator which is turned by the car wheels. The generator transfers part of the car’s kinetic energy to a battery
- January 2008, PA04A (2008 spec), Q14 (2 marks): 14 A wire of length 0.50 m, forming part of a complete circuit, is positioned at right angles to a uniform magnetic field. The graph shows how the force acting
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