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Describe how changes in the current's magnitude and direction affect the magnetic field around straight wires and solenoids.

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Cambridge IGCSE PhysicsElectricity and magnetismSupplement content

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Describe how changes in the current's magnitude and direction affect the magnetic field around straight wires and solenoids

  • This point belongs to Magnetic effect of a current, especially Magnetic effect of a current outcomes.
  • You need to be able to describe how changes in the current's magnitude and direction affect the magnetic field around straight wires and solenoids.
  • The key ideas to know are Describe and Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DescribeExplain

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This objective helps connect Magnetic effect of a current outcomes to exam-style questions, flashcards, and revision notes for Magnetic effect of a current.

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Paper 4 structured question: Magnetic effect of a current

Paper 4Theory (Extended)1 marks

Description

Magnetic Field Around a Wire

A straight wire carries an electric current. The current can be increased or reversed.

  1. a

    State the effect of increasing the current on the magnetic field strength around the wire.

    Aim for approximately 1 distinct marking point.

    [1]
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