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2 marksElectromagnetic Induction

CAPE Physics Unit 2 · 2009 · Paper 2 · Question 4(b)(i)

A copper disc of diameter 40 mm spins inside a long solenoid along its axis, connected to a millivoltmeter via rim and axle contacts.

Explain why an e.m.f. is generated between the axle and the rim of the disc as it rotates.

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Other parts of this question

  1. 4(a)(i)Distinguish between 'magnetic flux density' and 'magnetic flux'.[2 marks]
  2. 4(a)(ii)State Faraday's law of electromagnetic induction.[1 mark]
  3. 4(a)(iii)State Lenz's law.[1 mark]
  4. 4(b)(ii)a)Calculate the magnetic field within the solenoid.[2 marks]
  5. 4(b)(ii)b)Calculate the magnetic flux cut by the disc in every revolution.[2 marks]
  6. 4(b)(ii)c)Calculate the potential difference maintained between the rim and the axle of the disc.[2 marks]
  7. 4(c)Describe how the apparatus in Figure 5 could verify Faraday's law: sketch the expected graph of e.m.f. versus motor speed, explain how the conclusion is drawn…[3 marks]

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