plumiMagnetic circuits: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 6.1.1.4 Magnetic circuits, 2016–2025, with mark schemes and examiner’s reports where available.
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Q2(a)(ii)
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All 8 questions on Magnetic circuits, as a list
- June 2022, Paper 2, Q2(a)(ii) (2 marks): The permeance of a magnetic circuit can be compared to the conductivity of an electrical circuit. Suggest and explain a change to the generator in Fig. 2.1 whic
- 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(a)(ii) (2 marks): In Fig. 39.1b the rotor has rotated 90° aligning between coils 3 and 1. Coil 2 is off, coil 1 pole is a S and coil 3 pole is a N. Complete the path of the singl
- November 2021, Paper 1, Q39(b) (3 marks): Explain each of the following design features of the motor: 1 The stator is made of iron. 2 The stator is laminated (made of layers of iron separated by thin la
- November 2020, Paper 3, Q4(d)(ii) (2 marks): Complete the diagram by adding two lines which represent the flux in the core at the instant shown. [2]
- November 2020, Paper 3, Q4(d)(iii) (1 mark): State the effect of increasing the length of the magnetic circuit of the transformer. [1] Another student has a faulty set of apparatus such that the C-cores do
- November 2020, Paper 3, Q4(d)(iv) (6 marks): Explain how a small air gap affects the magnetic circuit in Fig. 4.4 and why the core is made of vertically stacked laminated sheets rather than a solid block o
- June 2017, Paper 1, Q21 (1 mark): Which of the following changes doubles the flux in a magnetic circuit? 1 doubling the permeance 2 doubling the current-turns 3 halving the circuit length A 1, 2
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