The teacher decreases the current in the wire. How does the strength of the magnetic field around the wire change?

Answer options:

Decreases

Stays the same

Increases

How to approach this question

Recall the relationship between the current in a wire and the strength of the magnetic field it produces. Is it a direct or inverse relationship? What happens to the field if the current is reduced?

Full Answer

A.Decreases✓ Correct

The strength of the magnetic field produced by a current-carrying wire is directly proportional to the size of the current. This means that if the current increases, the magnetic field strength increases. Conversely, if the current decreases, the magnetic field strength also decreases.

Common mistakes

✗ Thinking the relationship is inverse (e.g., less current means stronger field).\n✗ Believing the field strength is constant regardless of the current.

Question 02.5 All questions Question 02.7

Practice the full AQA GCSE Physics Foundation Tier Paper 2

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The teacher decreases the current in the wire. How does the strength of the magnetic field around the wire change?

How to approach this question

Full Answer

Common mistakes

Practice the full AQA GCSE Physics Foundation Tier Paper 2

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