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Cambridge AS & A Level Physics

20.3Force on a moving charge

Force on a moving charge 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. 20.3.1Determine the direction of the force on a charge moving in a magnetic field.
  2. 20.3.2Recall and use F = BQv sin θ.
  3. 20.3.3Explain the origin of the Hall voltage and derive and use V_H = BI/(ntq).
  4. 20.3.4Explain how a Hall probe measures magnetic flux density.
  5. 20.3.5Describe the motion of a charged particle moving perpendicular to a uniform magnetic field.
  6. 20.3.6Explain velocity selection with electric and magnetic fields.

Lessons

  • 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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Sample question

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

Force on a moving charge: sample question

1 mark

An electron moves to the right, across the page, in a uniform magnetic field directed into the page. In which direction is the magnetic force on it as it enters the field?

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