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AQA GCSE · Question 02.7 · Magnetism and electromagnetism
The teacher reverses the direction of the current in the wire. What happens to the magnetic field around the wire?
The teacher reverses the direction of the current in the wire. What happens to the magnetic field around the wire?
How to approach this question
Consider how the direction of the magnetic field is related to the direction of the current. If the current changes direction, what happens to the field?
Full Answer
The direction of the magnetic field reverses.
The direction of the magnetic field around a current-carrying wire is determined by the direction of the current. This relationship is described by the right-hand grip rule. If you reverse the direction of the current, the direction of the magnetic field also reverses. For example, if the field was clockwise, it would become anti-clockwise.
Common mistakes
✗ Stating that the field disappears or gets weaker/stronger. Reversing the current only affects the direction, not the strength.
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