AQA · Physics · 8463
GCSE Physics: Induced potential
Magnetism and electromagnetism · AQA GCSE Physics (8463), specification point 4.7.3.1. Cards are generated from the exam board's own specification for "Induced potential", and every card links back to the page it came from. Higher tier only. Separate science only. Specification © AQA — used with attribution.
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What is induced when a conductor moves relative to a magnetic field?
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A potential difference across the ends of the conductor.
Besides moving a conductor, what else induces a potential difference across it?
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A change in the magnetic field around the conductor.
What condition is needed for an induced potential difference to produce an induced current?
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The conductor must be part of a complete circuit.
Inducing a potential difference by moving a conductor relative to a magnetic field is called the ? effect.
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generator
What does the magnetic field produced by an induced current do?
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It opposes the original change that caused it (the movement of the conductor or the change in magnetic field).
Why does it take more force to move a magnet faster into a coil connected in a circuit?
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The induced current creates a magnetic field that opposes the magnet's motion, and a faster change gives a larger induced current and so a stronger opposing field.
Name one factor that increases the size of an induced potential difference.
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Moving the conductor (or changing the field) faster; a stronger magnetic field; or more turns on the coil.
How can the direction of an induced current be reversed?
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By reversing the direction of motion of the conductor, or by reversing the direction of the magnetic field.
Is an induced potential difference produced when a conductor is stationary in a constant magnetic field?
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No — there must be relative movement or a changing magnetic field.
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