plumiUniform fields and the charge on the electron: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 6.1.2.1 Uniform fields and the charge on the electron, 2016–2025, with mark schemes and examiner’s reports where available.
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Q40(b)(i)
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All 23 questions on Uniform fields and the charge on the electron, as a list
- June 2025, Paper 1, Q40(b)(i) (3 marks): Use data for the oil drop when it is falling. [3]
- June 2025, Paper 1, Q40(b)(ii) (3 marks): Calculate the charge on the oil drop. Use data for the oil drop when it is stationary. charge = C [3]
- June 2025, Paper 2, Q2(a)(ii) (2 marks): A free electron in air travels about 700 nm between collisions with molecules. Use your answer to (a)(i) to calculate the strength of a uniform electric field r
- June 2025, Paper 2, Q2(a)(iii) (2 marks): Explain why the number of ions formed per second will initially rise at increasing rate after the first ionisation event. [2]
- June 2024, Paper 1, Q40(a)(i) (2 marks): Show that the speed of the electrons when they enter the magnetic field is about 1.9 × 107 m s–1. Ignore relativistic effects. [2]
- 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 2023, Paper 1, Q6 (1 mark): Two parallel conducting plates P and Q have a p.d. V between them. They are separated by distance d. + V 0 V d P Q Which graph shows the variation of electric f
- June 2022, Paper 2, Q1(c)(i) (2 marks): Draw six lines on Fig. 1.2 to represent the uniform field between the plates. Assume that the oil drop does not distort the field. [2]
- June 2022, Paper 2, Q1(c)(ii) (2 marks): The drop of mass 1.8 × 10–15 kg is held stationary between the plates when the p.d.V between the plates is 200 V. The plate separation is 5.4 mm. Calculate the
- June 2022, Paper 2, Q1(c)(iii) (2 marks): When Millikan and Fletcher performed this experiment with many oil drops, they found that the charge on the drop was always a multiple of about 1.6 × 10–19 C (t
- November 2020, Paper 1, Q42(a)(iii) (1 mark): The distance AB is 5.0 mm. Calculate the electric field between the plates. electric field = V m−1 [1]
- June 2019, Paper 1, Q13 (1 mark): Two horizontal metal plates are 5.0 mm apart. The plates are at potentials of + 120 V and + 40 V. + 120 V 5.0 mm + 40 V What is the force experienced by an elec
- June 2019, Paper 2, Q4(a)(i) (2 marks): An electron is accelerated through a p.d. of 4.3 kV. Calculate the velocity of the accelerated electron. Ignore relativistic effects. velocity = m s–1 [2]
- June 2019, Paper 2, Q6(a) (1 mark): State how Fig. 6.2 shows that the electric field is uniform within the selector. [1]
- 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 2018, Paper 1, Q11 (1 mark): An electron is travelling at a speed of 3.1 # 105 m s−1. What is its kinetic energy in electronvolts? 4.4 # 10−20 eV A 8.8 # 10−7 eV B C 0.27 eV D 500 eV Your a
- June 2018, Paper 1, Q37(b)(i) (2 marks): A positive ion of charge Q and mass m is accelerated through a p.d. V. Show that the p it gains is given by the expression momentum per unit mass m p c m. Q 2 V
- June 2018, Paper 1, Q37(b)(ii) (2 marks): Discuss an advantage of using ions of hydrogen 1H+ as propellant instead of xenon 130Xe+. [2]
- June 2018, Paper 3, Q3(b)(i) (2 marks): Calculate the electric field strength E between the two parallel plates. Include a suitable unit. E = …………………. unit ………… [2]
- June 2018, Paper 3, Q3(b)(ii) (3 marks): Calculate the charge q carried by each oil drop. q = C [3]
- June 2018, Paper 3, Q3(b)(iii) (2 marks): This calculation does not take into account the effect of buoyancy from the displaced air. This effect produces an additional upwards force on the oil drop. Exp
- June 2018, Paper 3, Q3(c) (2 marks): The charge on the parallel metal plates is reversed. Explain the effect this has on the motion of the oil drop. [2]
- June 2017, Paper 1, Q25 (1 mark): An oil drop of mass m charged by one electron is balanced between two parallel horizontal metal plates. A potential difference V is applied between the plates a
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