AQA · Physics · 8463
GCSE Physics: Electromagnetism
Magnetism and electromagnetism · AQA GCSE Physics (8463), specification point 4.7.2.1. Cards are generated from the exam board's own specification for "Electromagnetism", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What is produced around a wire when a current flows through it?
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A magnetic field.
Which two factors determine the strength of the magnetic field around a current-carrying wire?
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The current through the wire and the distance from the wire (greater current → stronger field; greater distance → weaker field).
Why does shaping a wire into a solenoid increase the magnetic field strength?
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The fields from each turn of the coil add together, producing a much stronger field than a straight wire.
The magnetic field inside a solenoid is strong and ?.
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uniform
The magnetic field around a solenoid resembles the field of which object?
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A bar magnet.
How can the magnetic field of a solenoid be made stronger?
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By adding an iron core inside the solenoid.
An electromagnet is a solenoid with an ? core.
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iron
How can the magnetic effect of a current be demonstrated?
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Place a plotting compass near a current-carrying wire: the compass needle deflects when the current is switched on.
What shape are the magnetic field lines around a straight current-carrying wire?
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Concentric circles centred on the wire, getting further apart as distance from the wire increases.
What happens to the magnetic field around a wire if the current is reversed?
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The direction of the magnetic field reverses.
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