plumiCharge: OCR A‑Level Physics A questions
Every OCR A-Level Physics A exam question on 4.1.1 Charge, 2016–2025, with its mark scheme and examiner’s report.
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Calculations
Q16(b)
The whole paper ↗![June 2025 Paper 2, question 16(b): Draw an arrow on the circuit to show the direction of conventional current. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h55602-jun25-16-b-qp.webp?v=3)
Q3(a)(i)
The whole paper ↗![June 2025 AS Paper 2, question 3(a)(i): On the filter paper shown in Fig. 3.2, draw an arrow to indicate the conventional current I for the visible charge carriers of crystal Z. Label the arrow I. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h15602-jun25-03-ai-qp.webp?v=3)
Q3(a)(ii)
The whole paper ↗![June 2025 AS Paper 2, question 3(a)(ii): Compare the visible charge carriers of crystal Y with the visible charge carriers of crystal Z. Explain your answer. [4]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h15602-jun25-03-aii-qp.webp?v=3)
Q19(b)(iii)
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Q22(b)(ii)
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Q7(b)(ii)
The whole paper ↗![June 2024 AS Paper 2, question 7(b)(ii): the number of electrons N passing through r. N = [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h15602-jun24-07-bii-qp.webp?v=3)
Q23(c)
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Q23(b)(i)
The whole paper ↗![November 2021 AS Paper 1, question 23(b)(i): Calculate the number of electrons passing through the filament in one second. number of electrons = [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h15601-nov21-23-bi-qp.webp?v=3)
Q5(c)(iii)
The whole paper ↗![November 2021 AS Paper 2, question 5(c)(iii): Calculate the charge Q passing through the variable resistor in 5.0 minutes. Include an appropriate unit. Q = unit [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h15602-nov21-05-ciii-qp.webp?v=3)
Q23(b)(ii)
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Q1(c)
The whole paper ↗
![November 2020 AS Paper 1, question 16: What is the S.I. unit for electrical charge? A ampere B coulomb C ohm D volt Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h15601-nov20-16-qp.webp?v=3)
All 30 questions on Charge, as a list
- June 2025, Paper 2, Q14 (1 mark): Many types of charged particles can be created in particle accelerators. The charge on an unknown particle is measured in four different experiments. Which expe
- June 2025, Paper 2, Q16(b) (1 mark): Draw an arrow on the circuit to show the direction of conventional current. [1]
- June 2025, AS Paper 2, Q3(a)(i) (1 mark): On the filter paper shown in Fig. 3.2, draw an arrow to indicate the conventional current I for the visible charge carriers of crystal Z. Label the arrow I. [1]
- June 2025, AS Paper 2, Q3(a)(ii) (4 marks): Compare the visible charge carriers of crystal Y with the visible charge carriers of crystal Z. Explain your answer. [4]
- June 2024, Paper 2, Q19(b)(iii) (2 marks): 12 X‑ray photons are detected every minute. Use your answer to (a) to calculate the current I leaving the photocathode. Assume that all the photons of light pro
- June 2024, Paper 2, Q22(b)(ii) (3 marks): A fork lightning strike has a duration of 25 ms. The cloud discharges at a constant rate. The cloud is uncharged after the strike. Calculate the number of elect
- June 2024, AS Paper 1, Q11 (1 mark): The diagrams show the currents entering and leaving a junction in an electric circuit. Which diagram could be correct? A B 1A 2A 1A 1A 4A 1A 1A 5A C D 2A 1A 1A
- June 2024, AS Paper 2, Q7(b)(ii) (2 marks): the number of electrons N passing through r. N = [2]
- June 2023, AS Paper 1, Q19 (1 mark): The diagram shows the currents passing in and out of a point in a circuit. 0.5 A 1.6 A 1.4 A I What is the value of the current I? A 0.3 A B 0.5 A C 2.5 A D 3.0
- June 2023, AS Paper 1, Q20 (1 mark): An uncharged oil drop gains a charge of +4.0 × 10–18 C. What is the change in the number of electrons on the oil drop? A Gained 25 electrons B Gained 64 electro
- June 2022, Paper 2, Q1 (1 mark): A current is present in the circuit below. A electrolyte The resistor is made from a length of wire. Which row gives the correct charge carriers in the resistor
- June 2022, Paper 2, Q23(c) (2 marks): In a single photomultiplier tube, a photon of light produces a 0.32 μA pulse of current for a duration of 1.2 ns. Calculate the number of electrons responsible
- June 2022, AS Paper 1, Q10 (1 mark): A total of 3.8 × 107 electrons flow through a wire in a time of 1.2 μs. What is the current in the wire? 6.1 × 10–12 A A 7.3 × 10–12 A B 5.1 × 10–6 A C 3.2 × 10
- November 2021, AS Paper 1, Q23(b)(i) (2 marks): Calculate the number of electrons passing through the filament in one second. number of electrons = [2]
- November 2021, AS Paper 2, Q5(c)(iii) (2 marks): Calculate the charge Q passing through the variable resistor in 5.0 minutes. Include an appropriate unit. Q = unit [2]
- November 2020, Paper 2, Q23(b)(ii) (5 marks): The dome discharges slowly through the plastic rod. It takes 78 hours for the dome to completely discharge. 1 Show that the mean current I in the plastic rod is
- November 2020, Paper 3, Q1(c) (2 marks): When the ball oscillates between the plates, the current in the external circuit is 3.2 × 10–8 A. A charge of 9.0 nC moves across the gap between the plates eac
- November 2020, AS Paper 1, Q1 (1 mark): One of Kirchhoff’s laws is stated below. The sum of the currents entering a point in a circuit is equal to the sum of the currents leaving the same point. Which
- November 2020, AS Paper 1, Q16 (1 mark): What is the S.I. unit for electrical charge? A ampere B coulomb C ohm D volt Your answer [1]
- November 2020, AS Paper 1, Q20 (1 mark): Two electrodes are placed into a liquid (electrolyte). The electrodes are connected to a cell. + – electrode electrode electrolyte Which row is correct? Directi
- November 2020, AS Paper 2, Q7(a)(ii) (2 marks): the number N of electrons passing through the heater in 5.0 hours N = [2]
- June 2019, Paper 2, Q1 (1 mark): Which law indicates that charge is conserved? A Lenz’s law B Coulomb’s law C Kirchhoff’s first law D Faraday’s law of electromagnetic induction Your answer [1]
- June 2019, Paper 2, Q3 (1 mark): Part of an electric circuit is shown below. 0.020 A Y 0.060 A The direction of all the currents and the magnitude of two currents are shown. How many electrons
- June 2019, AS Paper 1, Q15 (1 mark): The electric charge on particles is quantised and a multiple of the elementary charge. Which charge on a particle is possible? 1.0 × 10–19 C A 4.0 × 10–19 C B 8
- June 2019, AS Paper 2, Q4(a)(iii) (3 marks): Calculate the charge Q passing through resistor Y in two minutes (include an appropriate unit). Q = unit: [3]
- June 2018, Paper 2, Q1 (1 mark): Which electrical quantity has S.I. units ampere-second (A s)? A charge B current C resistance D potential difference Your answer [1]
- June 2018, Paper 3, Q6(c)(ii) (3 marks): 2000 photoelectrons are released from the photocathode. Each photoelectron has enough energy to release four electrons from the first dynode at the collision. T
- June 2018, AS Paper 1, Q16 (1 mark): The current at a point in a circuit is 10 mA. Expressed to the nearest power of ten, how many electrons pass the point in 10 s? 102 A 1015 B 1018 C 1021 D Your
- June 2017, Paper 2, Q1 (1 mark): The diagram below shows the motion of positive and negative particles in a conducting solution. solution + – + – Which statement is correct? A The current in th
- June 2016, AS Paper 1, Q12 (1 mark): The diagram shows the conventional currents entering and leaving a junction in an electric circuit. I1, I2, I3 and I4 are all positive. I2 I1 I3 I4 Which statem
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