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Cambridge AS & A Level Physics

20Magnetic fields

Magnetic fields in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Topic125 practice questions6 lessons
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In this topic

Lessons

  • Force on a current-carrying conductor and magnetic flux density

    45 min

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  • Force on moving charges in magnetic fields

    45 min

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  • The Hall effect and the Hall probe

    40 min

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  • Magnetic fields and the fields of currents

    40 min

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  • 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.

Magnetic fields: 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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