AQA a level physics paper 2
1. Line of force: Direction a hypothetical "free north pole" would travel in the
field. Otherwise known as a field line.
2. Motor effect: Effect in which a current in a magnetic field experiences a force.
3. Fleming's left hand rule: Way of working out the directions involved in the
motor effect.
4. Magnetic flux density: Force per unit length per unit current on a conductor
perpendicular to the field lines. Often referred to as the strength of the
magnetic field.
5. Couple: Pair of forces in opposite directions that try to turn an object. Acts on
the coil of a motor.
6. Thermionic: Property of a material that means that when it gets hot, it emits
electrons.
7. Cyclotron: Spiral particle accelerator.
8. Frequency: Number of rotations per second, given by 1/T.
9. Mass spectrometer: Device that separates a constituents of a substance by
their masses.
10. Ion: Charged atom.
11. Velocity selector: Component that uses an opposing electric and magnetic
field to ensure all particles going straight through have the same speed and
direction. 12. Vacuum: Space where (nearly) all particles have been removed
(evacuated).
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, AQA a level physics paper 2
.
13. Electromotive force: Force on electrons that tries to push them along. Known
as the emf.
14. Electromagnetic induction: Phenomenon in which a changing magnetic
field, relative to a wire, will produce an emf.
15. Fleming's right hand rule: Also known as the dynamo rule. Works out
directions involved in electromagnetic induction.
16. Solenoid: Electrical coil.
17. Lenz's law: "The direction of the induced current is always such as to oppose
the change that caused the current".
18. Magnetic flux: Product of the magnetic flux density and the area.
19. Magnetic flux linkage: Product of the magnetic flux and the number of turns
of the coil.
20. Faraday's law: "The induced emf in a circuit is equal to the rate of change of
flux linkage through the circuit". 21. Alternator: Generator of AC.
22. Back emf: An emf generated in a motor that works against the current that is
powering the motor.
23. Step-up: Transformer that raises the voltage and lowers the current (answer
is hyphenated!)
24 Step-down: Transformer that lowers the voltage and raises the current
(answer is hyphenated!)
2/9
1. Line of force: Direction a hypothetical "free north pole" would travel in the
field. Otherwise known as a field line.
2. Motor effect: Effect in which a current in a magnetic field experiences a force.
3. Fleming's left hand rule: Way of working out the directions involved in the
motor effect.
4. Magnetic flux density: Force per unit length per unit current on a conductor
perpendicular to the field lines. Often referred to as the strength of the
magnetic field.
5. Couple: Pair of forces in opposite directions that try to turn an object. Acts on
the coil of a motor.
6. Thermionic: Property of a material that means that when it gets hot, it emits
electrons.
7. Cyclotron: Spiral particle accelerator.
8. Frequency: Number of rotations per second, given by 1/T.
9. Mass spectrometer: Device that separates a constituents of a substance by
their masses.
10. Ion: Charged atom.
11. Velocity selector: Component that uses an opposing electric and magnetic
field to ensure all particles going straight through have the same speed and
direction. 12. Vacuum: Space where (nearly) all particles have been removed
(evacuated).
1/9
, AQA a level physics paper 2
.
13. Electromotive force: Force on electrons that tries to push them along. Known
as the emf.
14. Electromagnetic induction: Phenomenon in which a changing magnetic
field, relative to a wire, will produce an emf.
15. Fleming's right hand rule: Also known as the dynamo rule. Works out
directions involved in electromagnetic induction.
16. Solenoid: Electrical coil.
17. Lenz's law: "The direction of the induced current is always such as to oppose
the change that caused the current".
18. Magnetic flux: Product of the magnetic flux density and the area.
19. Magnetic flux linkage: Product of the magnetic flux and the number of turns
of the coil.
20. Faraday's law: "The induced emf in a circuit is equal to the rate of change of
flux linkage through the circuit". 21. Alternator: Generator of AC.
22. Back emf: An emf generated in a motor that works against the current that is
powering the motor.
23. Step-up: Transformer that raises the voltage and lowers the current (answer
is hyphenated!)
24 Step-down: Transformer that lowers the voltage and raises the current
(answer is hyphenated!)
2/9
