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Permanent and induced magnetism, magnetic forces and fields
This topic establishes magnetic attraction, repulsion, non-contact forces, magnetic materials, compass plotting and the evidence for the Earth's magnetic field.
25
Objectives
125
Flashcards
125
Questions
90 min
Study time
AQAGCSEPhysicsMagnetism and electromagnetism
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Syllabus checklist
What you need to know
25 objective pages available
Poles of a magnet11 objectives
- State that the poles of a magnet are the places where magnetic forces are strongest.
- Describe how two magnets exert forces on each other when brought close together.
- State that two like magnetic poles repel each other.
- State that two unlike magnetic poles attract each other.
- Describe attraction and repulsion between magnetic poles as non-contact forces.
- State that a permanent magnet produces its own magnetic field.
- Describe an induced magnet as a material that becomes a magnet when placed in a magnetic field.
- State that induced magnetism always causes a force of attraction.
- State that an induced magnet loses most or all of its magnetism quickly when removed from the magnetic field.
- Describe the attraction and repulsion between unlike and like poles for permanent magnets.
- Describe the difference between permanent and induced magnets.
Magnetic fields14 objectives
- Define a magnetic field as the region around a magnet where a force acts on another magnet or on a magnetic material.
- Identify iron, steel, cobalt and nickel as magnetic materials named in the specification.
- State that the force between a magnet and a magnetic material is always attraction.
- Describe how magnetic field strength depends on distance from the magnet.
- State that a magnetic field is strongest at the poles of a magnet.
- Describe the direction of a magnetic field as the direction of the force on a north pole placed at that point.
- State that magnetic field lines go from the north-seeking pole to the south-seeking pole of a magnet.
- Describe a magnetic compass as containing a small bar magnet.
- State that the Earth has a magnetic field.
- Describe how a compass needle points in the direction of the Earth's magnetic field.
- Describe how to plot the magnetic field pattern of a magnet using a compass.
- Draw the magnetic field pattern of a bar magnet showing how strength and direction change from one point to another.
- Explain how the behaviour of a magnetic compass is evidence that the core of the Earth must be magnetic.
- Apply WS 2.2 when using diagrams to represent magnetic field patterns.
Key terms
Poles of a magnet direction cue 1Poles of a magnet cause cue 2Poles of a magnet evidence cue 3Poles of a magnet boundary cue 4Poles of a magnet application cue 5Poles of a magnet measurement cue 6Poles of a magnet diagnosis cue 7Poles of a magnet prediction cue 8Poles of a magnet comparison cue 9Poles of a magnet safety cue 10Poles of a magnet efficiency cue 11Poles of a magnet energy-transfer cue 12
Exam tips
- generator-effect induction exam tip for Poles of a magnet: Use generator-effect induction explicitly, then link it to a bar magnet and plotting compass practical and state how it avoids confusing permanent and induced magnets.
- generator-effect induction exam tip for Poles of a magnet: Use generator-effect induction explicitly, then link it to a steel core electromagnet demonstration and state how it avoids confusing permanent and induced magnets.
Common mistakes
- generator-effect induction: avoid permanent and induced magnets: Instead, identify the exact Unit 4.7 idea in Poles of a magnet, then explain how it links to a bar magnet and plotting compass practical and the objective to state that the poles of a magnet are the places where magnetic forces are strongest.
- generator-effect induction: avoid permanent and induced magnets: Instead, identify the exact Unit 4.7 idea in Poles of a magnet, then explain how it links to a steel core electromagnet demonstration and the objective to describe how two magnets exert forces on each other when brought close together.
Practice preview
- Select the statement that would earn credit in an AQA GCSE Physics answer. Context: bench-top compass mapping direction. Learning objective: State that the poles of a magnet are the places where magnetic forces are strongest.. Which answer is most accurate for Poles of a magnet? Distinct revision anchor: fluxcue101a coilcue101b fieldcue101c polecue101d gridcue101e motorcue101f generatorcue101g transformercue101h compasscue101i currentcue101j voltagecue101k forcecue101l.
- Which explanation best links the observation to the physics? Context: scrapyard lifting magnet direction. Learning objective: State that the poles of a magnet are the places where magnetic forces are strongest.. Which answer is most accurate for Poles of a magnet? Distinct revision anchor: fluxcue102a coilcue102b fieldcue102c polecue102d gridcue102e motorcue102f generatorcue102g transformercue102h compasscue102i currentcue102j voltagecue102k forcecue102l.
- Which conclusion keeps the magnetism concept boundary clear? Context: school bell electromagnet direction. Learning objective: State that the poles of a magnet are the places where magnetic forces are strongest.. Which answer is most accurate for Poles of a magnet? Distinct revision anchor: fluxcue103a coilcue103b fieldcue103c polecue103d gridcue103e motorcue103f generatorcue103g transformercue103h compasscue103i currentcue103j voltagecue103k forcecue103l.
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