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Topic 7: Magnetism and Electromagnetism. Notes (Content in bold is for Higher Tier only) wwwpmteducation
Magnetic Fields Electromagnetism The magnetic field is the area surrounding a magnet where the force is acting on another magnet or magnetic material. It can be observed using a compass placed at different points around a bar magnet. The field lines can be drawn by using the compass to mark the direction at a range of points.
Magnetic materials that can be permanently magnetised are described as magnetically hard (e.g. steel). Magnetic materials that are only temporarily magnetised are described as magnetically soft (e.g. soft iron). Magnetic field lines represent the magnetic force on a north pole at a given point.
This topic is included in Paper 1, Paper 2, Paper 3, Paper 4, Paper 5 and Paper 6 for IGCSE CAIE Physics.
Revision Pack Topic 7- Magnetism & Electromagnetism Explain the right hand rule: How can you increase the strength of the magnetic field that a wire produces? Define the term electromagnet. To increase the strength of an electromagnet: C- C-
Electromagnet: A solenoid with an iron core. Fleming’s Left-Hand Rule: A rule used to determine the orientation of the force (thumb), current (second finger) and magnetic field (first finger) when a current-carrying wire is placed in a magnetic field (motor effect).
The textbook covers all the standard introductory topics, such as electrostatics, mag-netism, circuits, electromagnetic waves, and electric and magnetic fields in matter. Tak-ing a nontraditional approach, magnetism is derived as a relativistic effect. Mathemat-ical concepts are introduced in parallel with the physical topics at hand, making the
