Megnetisam — Chapter Summary
ICSE · Class 9 · Physics
Summary of Megnetisam for ICSE Class 9 Physics. Key concepts: Lodestone is an ore of iron, Bar magnets and A freely suspended magnet.
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Overview
Magnetism explains how certain materials attract iron, how magnets interact with each other, and how magnetic fields extend around them. Lodestone is the natural magnet, while artificial magnets include bar magnets, horse-shoe magnets, magnetic needles, and magnetic compasses. A freely suspended mag
Key Concepts
Lodestone is an ore of iron
Lodestone is an ore of iron oxide, Fe3O4, found in Magnesia, Asia Minor. It is a natural magnet and attracts small pieces of iron. It also sets itself
Bar magnets
Bar magnets, horse-shoe magnets, magnetic needles, and magnetic compasses are artificial magnets made for practical use. Natural magnets are often irr
A freely suspended magnet rests
A freely suspended magnet rests in the north-south direction. The end that points toward geographic north is called the north pole, and the other end
The temporary magnetism acquired by
The temporary magnetism acquired by a magnetic material when it is kept near or in contact with a magnet is called induced magnetism. A magnetic pole
A piece of iron is first
A piece of iron is first magnetised by induction and then attracted by the magnet. The iron is not attracted directly without first becoming magnetise
Learning Objectives
- Understand natural and artificial magnets and their basic properties
- Explain magnetic induction and induced magnetism
- Describe magnetic field and magnetic field lines
- Interpret the direction and pattern of field lines around magnets and Earth
- Explain Earth’s magnetism and the idea of neutral points
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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