Cambridge IGCSE Physics Notes 4.1: Simple Magnetism
Cambridge IGCSE Physics magnetism notes on poles, fields, induced magnetism, magnetic materials, permanent magnets, and electromagnets.
Q: What does Cambridge IGCSE Physics Notes 4.1: Simple Magnetism cover?
A: It follows official Cambridge Physics section 4.1 for syllabuses 0625 and 0972, with Core ideas separated from Supplement depth.
Magnetic fields describe forces around magnets and currents, while material behaviour determines whether magnetism is temporary or retained.
The ideas that organise this section
- Field direction outside a magnet is conventionally from north to south.
- Induced magnetism can create attraction without the second object initially being a magnet.
- Soft magnetic materials suit electromagnets; hard magnetic materials suit permanent magnets.
Core route
Core candidates should be ready to describe, calculate, interpret, and apply the following:
- Describe attraction and repulsion and draw magnetic field patterns.
- Use a plotting compass or iron filings to investigate a field.
- Distinguish magnetic and non-magnetic materials and temporary and permanent behaviour.
Supplement route
Extended candidates study all Core content and add the following depth:
- Explain induced magnetism and the choice of magnetic material for a device.
- Interpret field strength from field-line spacing without treating lines as physical objects.
Formula route
This section is mainly qualitative. Use precise definitions, labelled diagrams, and cause-and-effect explanations.
Write the relationship before substituting. Convert units first, keep extra figures during working, and round only the final answer to sensible precision.
Build a connected model
In Simple Magnetism, a strong answer connects the named quantity or model to observable evidence. Begin by defining the physical quantity in words or with its relationship. Identify which values are scalars and which require a direction. Represent the situation with a labelled diagram, graph, field pattern, ray or circuit when that makes the relationship visible. The representation is part of the reasoning: its labels, arrows and scale should agree with the written explanation.
For a calculation, write the governing relationship before substitution, convert prefixes and time units, keep unrounded values during working and attach the correct final unit. For a qualitative question, use a cause-link-consequence chain. Name what changes, state the physical mechanism that links the change to the system, and then give the measurable result. If two cases are compared, hold unrelated variables constant and use the same physical principle for both.
