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GCSE Physics · key term
The force on a current-carrying conductor placed in a magnetic field.
Used by AQA, Edexcel and OCR
Specification 4.7.2.2, 4.7.2.4 · Paper 2
The force produced when a current-carrying conductor is placed in a magnetic field.
Revise: Fleming's left-hand ruleThe current-carrying conductor experiences a force; the magnet producing the external field experiences an equal interaction in the opposite direction. This is called the motor effect.
The force on a current-carrying conductor when it is in a magnetic field.
Specification 12.10, 12.11, 12.14P, 13.4P · Paper 2
The effect in which a current-carrying conductor experiences a force when it is placed in a magnetic field.
Revise: Force on ConductorThis is called the motor effect. The conductor must be carrying a current; simply placing an ordinary unmagnetised wire near a magnet does not give the effect described here.
The force experienced by a current-carrying conductor in a magnetic field because its magnetic field interacts with the external field.
The force experienced by a current-carrying conductor in a magnetic field.
Specification P4.2a, P4.2b, P4.2c, P4.2d, P4.2j · Paper 1 (Foundation), Paper 3 (Higher)
The force produced when the magnetic field around a current-carrying conductor interacts with another magnetic field.
Revise: Force on conductorThese fields interact and produce a force. This is called the motor effect. The wire experiences a force from the magnet, while the magnet experiences an equal force in the opposite direction from the wire.
The force produced when a current-carrying conductor is placed in a magnetic field.
The force on a current-carrying conductor caused by its interaction with an external magnetic field.
The force experienced by a current-carrying conductor placed in a magnetic field because the conductor's field interacts with the external field.
The force experienced by a current-carrying conductor in a magnetic field.
Paper 1, Paper 2
The force produced when the magnetic field around a current-carrying conductor interacts with another magnetic field.
Revise: Electric motorsThe wire and magnet exert forces on each other: this is the motor effect. A straight wire free to move between the poles of a magnet can therefore move when current flows through it. Reversing the current reverses the direction of its movement.
Name the correct effect: electromagnetic induction in a moving-coil microphone; the motor effect in a loudspeaker or headphones.
Make clear that the conductor must carry a current: an unpowered wire does not demonstrate the motor effect.
Detailed motor construction is not required. Focus on the motor effect, the pair of forces and the reversal of current every half-turn for continuous rotation.
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