Magnetic Fields (GCSE) — GCSE Physics Revision
Revise Magnetic Fields (GCSE) for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Permanent & Induced MagnetsWhat is Magnetic Fields (GCSE)?
A magnetic field is a region where a magnetic force can be detected. Magnetic fields are produced by moving electric charges and are associated with permanent magnets and electromagnets. The direction of a magnetic field at a point is the direction that a north pole of a compass would point. Magnetic field lines are used to represent the field, with the density of the lines indicating the strength of the field.
Board notes: A fundamental topic for all GCSE Physics boards (AQA, Edexcel, OCR).
Step-by-step explanationWorked example
Draw the magnetic field around a bar magnet. Solution: Draw a bar magnet with a north and south pole. Draw field lines starting from the north pole and ending on the south pole. The lines should be closest together at the poles, indicating the field is strongest there. Add arrows to the lines to show the direction from north to south.
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Common mistakes
- 1Thinking that magnetic field lines cross over each other. They never cross.
- 2Forgetting that the direction of the field lines is from the north pole to the south pole outside the magnet.
- 3Confusing magnetic poles with electric charges. While they have similarities (like poles repel, unlike poles attract), they are different phenomena.
Magnetic Fields (GCSE) exam questions
Exam-style questions for Magnetic Fields (GCSE) with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Magnetic Fields (GCSE)
Core concept
A magnetic field is a region where a magnetic force can be detected. Magnetic fields are produced by moving electric charges and are associated with permanent magnets and electromagnets. The direction…
Frequently asked questions
How can you plot the magnetic field of a magnet?
You can plot a magnetic field by placing a plotting compass near the magnet and marking the direction it points. You then move the compass to the new position and repeat the process, creating a series of dots that can be joined to form a field line.
What is the Earth's magnetic field?
The Earth has a magnetic field that is thought to be generated by molten iron in its core. This field protects the Earth from harmful solar radiation and is why compasses point north.