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Cambridge AS & A Level Physics

20.2Force on a current-carrying conductor

Force on a current-carrying conductor in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic23 practice questions1 lesson

Learning objectives

What the syllabus expects you to be able to do.

  1. 20.2.1Recognise that a force can act on a current-carrying conductor in a magnetic field.
  2. 20.2.2Recall and use F = BIL sin θ with Fleming's left-hand rule.
  3. 20.2.3Define magnetic flux density as force per unit current per unit length on a perpendicular wire.

Lessons

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

    45 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 current-carrying conductor: sample question

1 mark

A horizontal wire runs from west to east and carries a current towards the east. The magnetic field is vertically downwards. What is the direction of the force on the wire?

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