AQA · Physics · 8463
GCSE Physics: Fleming's left-hand rule
Magnetism and electromagnetism · AQA GCSE Physics (8463), specification point 4.7.2.2. Cards are generated from the exam board's own specification for "Fleming's left-hand rule", and every card links back to the page it came from. Higher tier only. Specification © AQA — used with attribution.
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What is the motor effect?
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When a current-carrying conductor is placed in a magnetic field, the magnet producing the field and the conductor exert a force on each other.
What three quantities does Fleming's left-hand rule relate?
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The force on the conductor, the current in the conductor, and the magnetic field — it shows their relative orientation.
The force on a current-carrying conductor in a magnetic field is called the ? effect.
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motor
What is the equation for the force on a current-carrying conductor at right angles to a magnetic field?
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F = B I l (force = magnetic flux density × current × length).
In F = BIl, what does B represent?
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Magnetic flux density, measured in tesla (T).
What is the SI unit of magnetic flux density?
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The tesla (T).
In F = BIl, what does l represent and what is its unit?
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The length of the conductor in the magnetic field, in metres (m).
Under what condition does F = BIl apply to a conductor in a magnetic field?
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When the conductor is at right angles to the magnetic field.
How does the force on a current-carrying conductor change if the current is doubled?
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It doubles — force is directly proportional to current (F = BIl).
Force on a conductor at right angles to a magnetic field: F = B × I × ?, where l is the length of the conductor in metres.
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l
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