AQA a level physics paper 2
Line of force - ANSDirection a hypothetical "free north pole" would travel in the field. Otherwise
known as a field line.
Motor effect - ANSEffect in which a current in a magnetic field experiences a force.
Fleming's left hand rule - ANSWay of working out the directions involved in the motor effect.
Magnetic flux density - ANSForce per unit length per unit current on a conductor perpendicular
to the field lines. Often referred to as the strength of the magnetic field.
Couple - ANSPair of forces in opposite directions that try to turn an object. Acts on the coil of a
motor.
Thermionic - ANSProperty of a material that means that when it gets hot, it emits electrons.
Cyclotron - ANSSpiral particle accelerator.
Frequency - ANSNumber of rotations per second, given by 1/T.
Mass spectrometer - ANSDevice that separates a constituents of a substance by their masses.
Ion - ANSCharged atom.
Velocity selector - ANSComponent that uses an opposing electric and magnetic field to ensure
all particles going straight through have the same speed and direction.
, Vacuum - ANSSpace where (nearly) all particles have been removed (evacuated).
Electromotive force - ANSForce on electrons that tries to push them along. Known as the emf.
Electromagnetic induction - ANSPhenomenon in which a changing magnetic field, relative to a
wire, will produce an emf.
Fleming's right hand rule - ANSAlso known as the dynamo rule. Works out directions involved in
electromagnetic induction.
Solenoid - ANSElectrical coil.
Lenz's law - ANS"The direction of the induced current is always such as to oppose the change
that caused the current".
Magnetic flux - ANSProduct of the magnetic flux density and the area.
Magnetic flux linkage - ANSProduct of the magnetic flux and the number of turns of the coil.
Faraday's law - ANS"The induced emf in a circuit is equal to the rate of change of flux linkage
through the circuit".
Alternator - ANSGenerator of AC.
Back emf - ANSAn emf generated in a motor that works against the current that is powering the
motor.
Line of force - ANSDirection a hypothetical "free north pole" would travel in the field. Otherwise
known as a field line.
Motor effect - ANSEffect in which a current in a magnetic field experiences a force.
Fleming's left hand rule - ANSWay of working out the directions involved in the motor effect.
Magnetic flux density - ANSForce per unit length per unit current on a conductor perpendicular
to the field lines. Often referred to as the strength of the magnetic field.
Couple - ANSPair of forces in opposite directions that try to turn an object. Acts on the coil of a
motor.
Thermionic - ANSProperty of a material that means that when it gets hot, it emits electrons.
Cyclotron - ANSSpiral particle accelerator.
Frequency - ANSNumber of rotations per second, given by 1/T.
Mass spectrometer - ANSDevice that separates a constituents of a substance by their masses.
Ion - ANSCharged atom.
Velocity selector - ANSComponent that uses an opposing electric and magnetic field to ensure
all particles going straight through have the same speed and direction.
, Vacuum - ANSSpace where (nearly) all particles have been removed (evacuated).
Electromotive force - ANSForce on electrons that tries to push them along. Known as the emf.
Electromagnetic induction - ANSPhenomenon in which a changing magnetic field, relative to a
wire, will produce an emf.
Fleming's right hand rule - ANSAlso known as the dynamo rule. Works out directions involved in
electromagnetic induction.
Solenoid - ANSElectrical coil.
Lenz's law - ANS"The direction of the induced current is always such as to oppose the change
that caused the current".
Magnetic flux - ANSProduct of the magnetic flux density and the area.
Magnetic flux linkage - ANSProduct of the magnetic flux and the number of turns of the coil.
Faraday's law - ANS"The induced emf in a circuit is equal to the rate of change of flux linkage
through the circuit".
Alternator - ANSGenerator of AC.
Back emf - ANSAn emf generated in a motor that works against the current that is powering the
motor.
