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Cambridge AS & A Level Physics

18.3Electric force between point charges

Electric force between point charges 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. 18.3.1Treat a charged conducting sphere as a point charge at its centre for external points.
  2. 18.3.2Recall and use Coulomb's law in free space.

Lessons

  • Coulomb's law and the field of a point charge

    45 min

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Sample question

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

Electric force between point charges: sample question

1 mark

The separation of two point charges is halved and one of the charges is doubled. By what factor does the force between them change?

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Turn Electric force between point charges into a strength.

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