plumiCapacitance and stored energy: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 5.1.1.1 Capacitance and stored energy, 2016–2025, with mark schemes and examiner’s reports where available.
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Open the full PDFYour answerQ32(a)
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All 22 questions on Capacitance and stored energy, as a list
- June 2025, Paper 1, Q16 (1 mark): The graph shows how the potential difference across a capacitor varies with the charge on the capacitor. Potential difference 0 0 Charge What gives the capacita
- June 2025, Paper 1, Q32(a) (1 mark): Show that the energy stored in the capacitor is given by E = 1 2CV 2. [1]
- June 2025, Paper 1, Q32(b) (4 marks): A 680 μF capacitor is charged until it stores 12 mJ energy. It is then discharged through a 1.2 kΩ resistor. Calculate the time taken for the capacitor to trans
- June 2025, Paper 2, Q9(a) (2 marks): Use the equation given (line 76) in the article to show that the maximum value of capacitance during the oscillation is about 2.4 pF. [2]
- June 2025, Paper 2, Q9(b) (1 mark): Calculate the energy stored on the capacitor at this maximum value. energy stored = [1]
- June 2025, Paper 2, Q9(c) (3 marks): The capacitance at equilibrium position is 2.35 pF. Use this value and your value from (a) to calculate the mean current from the capacitor as the diaphragm mov
- June 2025, Paper 2, Q10 (6 marks): 10* Using appropriate equations, explain and compare how the phase of the output signal from dynamic and condenser microphones relates to the phase of the incid
- June 2025, Paper 2, Q11(a) (2 marks): Using equations for the capacitance of the membrane and air‑gap capacitors in an electret microphone (lines 100–105) to show that the total capacitance of the t
- June 2025, Paper 2, Q11(b) (2 marks): The total charge on the capacitors is 9.7 × 10–11 C. Calculate the potential difference across the two capacitors. potential difference = V [2]
- June 2024, Paper 1, Q29 (1 mark): The diagram shows a circuit used to find the capacitance of a capacitor. The capacitor is initially uncharged. A V The switch is closed and the variable resisto
- June 2023, Paper 1, Q10 (1 mark): The unit of capacitance is the farad F. 1 F is the same as: 1 A s Ω–1 A 1 V A–1 B 1 V C–1 C 1 Ω–1 s D Your answer [1]
- June 2023, Paper 1, Q24 (1 mark): A 4700 μF capacitor is connected across a 6.0 V supply as shown. It is discharged through a 6.0 kΩ resistor. 6.0 V 4700 μF 6.0 kΩ How long does it take, after t
- June 2023, Paper 3, Q3(c)(i) (3 marks): Starting from the equation given in (b)(i) and repeated below show that when t = 5τ, the energy stored in the capacitor, E = 4.5 × 10–5 E0, where E0 is the ener
- June 2022, Paper 1, Q28 (1 mark): When the capacitor is fully charged, the switch is moved to position Y. What is the energy stored on the capacitor after 10 s of discharge? A 0.013 J B 0.023 J
- June 2022, Paper 1, Q34(a) (3 marks): Explain the significance of the shaded area of the graph and the significance of the gradient of the graph. Link your explanations to the relevant equations. Sh
- November 2021, Paper 1, Q21 (1 mark): The graph shows the variation of the charge on a capacitor with the potential difference across that capacitor. 10.0 8.0 6.0 charge on capacitor / mC 4.0 2.0 0
- November 2021, Paper 2, Q2(a)(ii) (3 marks): Estimate the average power delivered to the component during this time. Explain why the value is an average. average power = W Explanation: [3] 5 In recent year
- November 2021, Paper 2, Q2(b) (4 marks): A 120 F supercapacitor has an internal resistance of 30 mΩ. At time t = 0.0 s it stores 300 J. Calculate the minimum time taken for the capacitor to transfer 25
- November 2020, Paper 2, Q1(a)(iii) (2 marks): Calculate the energy stored in the capacitor when the p.d. across it is 4.2 V (at t = 7.0 s). energy = J [2]
- November 2020, Paper 2, Q1(b)(ii) (3 marks): Calculate the time from the beginning of the discharge for the energy stored on the capacitor to fall to half its value. time = s [3]
- June 2017, Paper 1, Q7 (1 mark): What is the capacitance? 2 # 10–3 F A 144 # 10–3 F B 288 # 10–3 F C D 500 F Your answer [1]
- June 2017, Paper 1, Q8 (1 mark): Which of the following is the energy stored? 2 # 10–3 J A 144 # 10–3 J B 288 # 10–3 J C D 500 J Your answer [1]
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