plumiMoving charges in a magnetic field: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 6.1.2.4 Moving charges in a magnetic field, 2016–2025, with mark schemes and examiner’s reports where available.
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Q40(a)(i)
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All 21 questions on Moving charges in a magnetic field, as a list
- June 2025, Paper 1, Q40(a)(i) (2 marks): The electrons in the beam are accelerated through a potential difference V. When they enter the magnetic field of flux density B they follow a circular path of
- June 2025, Paper 1, Q40(a)(ii) (3 marks): Fig. 40.2 shows the path of the electron beam on the fluorescent screen when the magnetic field is produced by the coils. Fig. 40.2 y x The radius of the circul
- June 2025, Paper 3, Q2(d) (3 marks): Another method to measure magnetic field strength is to use a Hall probe. A small current passes through a slice of semiconductor material as represented in Fig
- June 2024, Paper 1, Q40(a)(ii) (4 marks): Describe the path followed by the electron beam when it is passing through the region of magnetic field. You may add to Fig. 40.1 in your description. Include c
- June 2024, Paper 1, Q40(b) (2 marks): Fig. 40.2 shows the same experiment when two vertical metal plates are positioned parallel to the initial velocity of the electron. A potential difference is ap
- June 2024, Paper 1, Q40(c) (4 marks): The same equipment is used to accelerate negative ions through a potential difference of 1.0 kV. With the same magnetic field, a potential difference of 120 V i
- June 2023, Paper 1, Q30 (1 mark): An electron travelling at 8.5 × 106 m s–1 enters a uniform magnetic field of flux density 0.57 mT. r What is the radius r of the circular path of the electron i
- June 2022, Paper 2, Q8(b)(i) (2 marks): The article states that the charged particles in the solar wind ‘spiral down the magnetic field near the poles’. Consider an electron in the solar wind moving w
- June 2022, Paper 2, Q8(b)(ii) (4 marks): Consider the situation represented in Fig. 8.2. An electron is travelling at 5.0 × 105 m s–1 at an angle of 25° to the direction of the magnetic field of streng
- June 2022, Paper 2, Q8(b)(iii) (2 marks): Suggest and explain how the spiral might change as the electron moves nearer to the pole, considering the strengthening field and the energy transferred to part
- November 2020, Paper 1, Q22 (1 mark): The speed of an alpha particle is 8 times the speed of a beta particle. They both travel through a 0.3 T uniform magnetic field perpendicular to their path. for
- November 2020, Paper 2, Q9(a) (3 marks): A doubly-charged carbon-14 atom is accelerated through a potential difference of 4.2 MV and enters a uniform magnetic field of strength 0.72 T. Use the equation
- November 2020, Paper 2, Q9(b) (2 marks): Explain why it is important to ensure that no 12CH2 2+ and 13CH+ ions reach the second deflecting magnet (See Fig. 6 in the Advance Notice Article). [2]
- June 2019, Paper 2, Q6(b)(i) (2 marks): By considering the forces on the charge, explain why the charge will not be deflected when v = Es . Bs [2]
- June 2019, Paper 2, Q6(b)(ii) (2 marks): Show that the units of magnetic field strength are equivalent to the unit of velocity. [2]
- June 2019, Paper 2, Q6(b)(iii) (3 marks): Describe and explain the motion of charges moving through the region if their velocities are not equal to Es . Bs [3]
- June 2019, Paper 2, Q6(c)(i) (1 mark): Show that the force on a proton moving at a velocity of 5.2 × 106 m s–1 at right angles to a field of strength 0.64 T is about 5.3 × 10–13 N. [1]
- June 2019, Paper 2, Q6(c)(ii) (2 marks): Calculate the radius r of the path the proton will follow. radius = m [2]
- June 2019, Paper 2, Q6(c)(iii) (3 marks): A beam of 12 6C and 14 6C singly charged positive ions with equal velocities enters a deflection region, travelling at right angles to a uniform magnetic field
- June 2018, Paper 1, Q20 (1 mark): Which expression gives the time for the particle to complete one circle of its motion? 2r m A Bqr 2r mr B Bq 2r m C Bq Bq D 2r m Your answer [1]
- June 2018, Paper 1, Q21 (1 mark): A proton and an α particle, with the same velocity, enter the region of constant magnetic flux density. r What is the ratio of the radii of their paths, ? a rpr
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