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Cambridge AS & A Level Physics

20.5Electromagnetic induction

Electromagnetic induction in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 20.5.1Define magnetic flux as flux density times the perpendicular area.
  2. 20.5.2Recall and use Φ = BA.
  3. 20.5.3Understand and use magnetic flux linkage.
  4. 20.5.4Explain experiments showing induced e.m.f. from changing flux, its direction opposing the change, and the factors affecting its size.
  5. 20.5.5Recall and use Faraday's and Lenz's laws.

Lessons

  • Lenz's law and applications of electromagnetic induction

    45 min

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  • Magnetic flux, flux linkage and Faraday's law

    45 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Electromagnetic induction: sample question

1 mark

A flat loop of area 0.050 m20.050\ \text{m}^2 is in a uniform field of 0.30 T0.30\ \text{T}. The normal to the loop makes an angle of 60∘60^\circ with the field. What is the flux through the loop?

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