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Magnetism and magnetic fields
Revision and exam practice for Magnetism and magnetic fields.
17
Objectives
10
Flashcards
10
Questions
90 min
Study time
OcrGcsePhysics A GatewayMagnetism and magnetic fields
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17 objective pages available
Understanding Magnetic Attraction and Repulsion1 objectives
- Communicate the key features of the attraction and repulsion between unlike and like poles for permanent magnets.
Permanent vs. Induced Magnets1 objectives
- Communicate the key features of the difference between permanent and induced magnets.
Understanding Magnetic Fields1 objectives
- Communicate the key features of the characteristics of the magnetic field of a magnet, showing how strength and direction change from one point to another.
Earth's Magnetic Field and Compass Behaviour1 objectives
- Account for the way the behaviour of a magnetic (dipping) compass is related to evidence that the core of the Earth must be magnetic.
Magnetic Effect of a Current and Magnetic Field Direction1 objectives
- Communicate the key features of the way to show that a current can create a magnetic effect and describe the directions of the magnetic field around a conducting wire.
Magnetic Field Strength Around a Conductor1 objectives
- Retrieve and apply knowledge of the strength of the field depends on the current and the distance from the conductor.
Enhancing the Magnetic Effect of a Solenoid1 objectives
- Account for the way solenoid arrangements can enhance the magnetic effect.
Higher: The Motor Effect - Force Between Magnets and Current-Carrying Conductors1 objectives
- Communicate the key features of the way a magnet and a current- carrying conductor exert a force on one another.
(Higher) Fleming’s Left-Hand Rule and the Motor Effect1 objectives
- Develop knowledge and skill in Fleming’s left-hand rule represents the relative orientations of the force, the current and the magnetic field.
The Motor Effect and Magnetic Force Calculation (Higher Tier)1 objectives
- Use knowledge of the equation that links the force on a conductor to the magnetic flux density, the current and the length of conductor to calculate the forces involved.
Understanding How Electric Motors Work (Higher Tier)1 objectives
- Account for the way the force exerted from a magnet and a current-carrying conductor is used to cause rotation in electric motors.
Understanding Electromagnetic Induction (Higher)1 objectives
- Retrieve and apply knowledge of a change in the magnetic field around a conductor can give rise to an induced potential difference across its ends, which could drive a current, generating a magnetic field that would oppose the original change.
Alternators and Dynamos (Higher)1 objectives
- Account for the way this effect is used in an alternator to generate a.c., and in a dynamo to generate d.c.
Higher: Transformers and Inducing Current1 objectives
- Account for the way the effect of an alternating current in one circuit, in inducing a current in another, is used in transformers.
Transformer Voltage and Turns Ratio (Higher)1 objectives
- Account for the way the ratio of the potential differences across the two coils in a transformer depends on the ratio of the numbers of turns in each.
Transformer Equations: Potential Difference and Turns (Higher Tier)1 objectives
- Use knowledge of the equations linking the potential differences and numbers of turns in the two coils of a transformer.
Converting Sound to Electrical Signals and Back (Higher)1 objectives
- Account for the action of the microphone in converting the pressure variations in sound waves into variations in current in electrical circuits, and the reverse effect as used in loudspeakers and headphones.
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Practice preview
- If you travel from the magnetic equator towards the magnetic north pole, what change would you observe in a dipping compass?
- A student places a bar magnet near an unmagnetised, soft iron paperclip. (a) Describe what happens to the paperclip when it is brought near the bar magnet. (b) Explain why this happens, referring to the type of magnet the paperclip becomes. (c) What happens to the paperclip when the bar magnet is removed? [5 marks]
- Which component of the Earth is primarily responsible for generating its magnetic field?
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