plumiForce on a current-carrying wire: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 6.1.1.3 Force on a current-carrying wire, 2016–2025, with mark schemes and examiner’s reports where available.
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Q2(c)(ii)
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All 12 questions on Force on a current-carrying wire, as a list
- June 2025, Paper 3, Q2(c)(ii) (3 marks): Use the value of gradient to calculate the value of magnetic field strength. Magnetic field strength = T [3]
- June 2022, Paper 2, Q4(a)(i) (2 marks): The reading on the electronic balance changes when the current in the wire changes. Explain why this is an example of Newton’s Third Law of motion. [2]
- June 2022, Paper 2, Q4(a)(ii) (2 marks): 0.040 m of the copper wire is within the uniform magnetic field which acts perpendicularly to the wire. The reading on the balance changes by 1.4 gram when the
- June 2022, Paper 2, Q4(a)(iii) (3 marks): The student records the balance reading for a range of current values. She plots a graph of balance reading (y-axis) against current (x-axis). Explain how she c
- June 2022, Paper 2, Q4(b)(i) (2 marks): A wire of length 0.90 m carries an alternating current of frequency 50 Hz. The tension in the wire can be changed using weights as indicated in Fig. 4.2. 50 Hz
- November 2021, Paper 1, Q23 (1 mark): The diagram is a section through part of an electrical linear motor. The motor contains a 50-turn coil of diameter 1.8 cm carrying a current of 0.16 A in a radi
- November 2021, Paper 1, Q39(a)(i) (1 mark): Explain why the rotor will turn clockwise when coil 1 pole is a S and coil 2 pole is a N and coil 3 is off. [1]
- November 2021, Paper 1, Q39(c) (2 marks): For this motor, suggest how to control each of the following. 1 The rate of rotation of the rotor. 2 The force that acts to turn the rotor. 1 2 [2]
- June 2018, Paper 1, Q40(b) (6 marks): Fig. 40.1 shows a simplified diagram of a d.c. motor with permanent magnets. Fig. 40.2 shows the graph of current in the coil against frequency of rotation for
- June 2017, Paper 3, Q3(a)(i) (2 marks): Draw, on Fig. 3.2, at least three lines to represent the magnetic field in the region between the magnetic poles when the current in the wire is zero. [2]
- June 2017, Paper 3, Q3(a)(ii) (2 marks): Explain why the balance reading changes to a new value when the wire carries a current. [2]
- June 2017, Paper 3, Q3(b)(iv) (3 marks): Use the graph to estimate the value of the B‑field between the faces of the slab magnets. B = mT [3]
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