plumiForce and field of a point charge: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 6.1.2.2 Force and field of a point charge, 2016–2025, with mark schemes and examiner’s reports where available.
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Q5(b)(i)
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All 14 questions on Force and field of a point charge, as a list
- June 2025, Paper 2, Q5(b)(i) (3 marks): Calculate the ratio of the force due to the electric field (electrostatic force) between a proton and an electron and the gravitational force between the same p
- June 2025, Paper 2, Q5(c)(i) (2 marks): Calculate the centripetal acceleration of an electron orbiting a proton at a separation of 0.5 × 10–10 m. centripetal acceleration = m s–2 [2]
- June 2023, Paper 1, Q35(b) (2 marks): Explain why the acceleration of the alpha particle is greatest at position A. [2]
- June 2022, Paper 1, Q26 (1 mark): The diagram shows a point X at displacement r from a single point charge +q. The electric field strength at X is E. +q X r A charge of –2q is brought to the sam
- June 2022, Paper 1, Q35(a) (2 marks): Use the data in the table to show that 1 electric field strength ∝ (distance from centre of charge)2 Explain your method. Explanation: [2]
- November 2021, Paper 1, Q38(a)(i) (2 marks): Show by calculation that E is about 1 × 1012 V m–1 at distance 40 × 10–12 m from the centre of the proton. [2]
- November 2021, Paper 1, Q38(a)(ii) (2 marks): Fig. 38.1 shows the electric field strength E near to a proton. 1.0 E / ×1012 V m–1 0.8 0.6 0.4 0.2 0.0 0 20 40 60 80 100 120 140 160 r / pm Fig. 38.1 Use any t
- November 2021, Paper 1, Q38(b)(i) (1 mark): Show that the kinetic energy of the electron in orbit is k e2 2r where k is the electric force constant = 1 / 4πεo. [1]
- June 2019, Paper 1, Q12 (1 mark): A positive and a negative charge of equal magnitude are placed near each other. Which diagram best represents the electric field of the two charges? A B – – + +
- June 2018, Paper 1, Q41(a)(i) (1 mark): Explain why the electric field strength at X is zero. [1]
- June 2018, Paper 1, Q41(b)(i) (4 marks): Show that the resultant force F on the third proton is about 4 # 10−10 N in the direction shown. Explain your reasoning. You may include a diagram in your answe
- June 2018, Paper 1, Q41(b)(ii) (2 marks): The separation of protons in a lithium the magnitude of the resultant electric force on a proton in the nucleus if the protons are arranged symmetrically as in
- June 2017, Paper 1, Q41(a) (2 marks): On the appropriate figure(s) mark a point • N where the electric field is zero and a point • V [2] where the electric potential is zero.
- June 2017, Paper 1, Q41(c) (2 marks): Fig. 41.2 can also represent two spherical charge distributions of +1 C and –1 C situated 1 km apart. Calculate the electric field midway between the charge cen
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