ExpertEasy1 markMultiple Choice
AQA GCSE · Question 02.6 · Magnetism and electromagnetism
The teacher decreases the current in the wire. How does the strength of the magnetic field around the wire change?
The teacher decreases the current in the wire. How does the strength of the magnetic field around the wire change?
Answer options:
A.
Decreases
B.
Stays the same
C.
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
Decreases
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.
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