Chapter 10 of 10
Revision Notes
Megnetisam — Revision Notes
ICSE · Class 9 · Physics
Megnetisam revision notes for ICSE Class 9 Physics: 4 topics in quick points. Part of the ICSE Class 9 Physics syllabus.
43 questions35 flashcards5 concepts
Interactive on Super Tutor
Studying Megnetisam? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for revision notes and more.
Free trial, no card needed.
Super Tutor
One of 15 illustrations for Megnetisam in Super Tutor — alongside flashcards, concept maps and practice questions.
Key Topics to Revise
1
1. Basic Ideas About Magnets
- Lodestone is a natural magnet and is an ore of iron oxide, Fe3O4, found in Magnesia, Asia Minor.
- The word magnet has been derived from magnesia.
- Lodestone attracts small pieces of iron and sets itself along a definite direction when suspended freely.
2
2. Induced Magnetism
- When an unmagnetised magnetic material is kept near or in contact with a magnet, it becomes magnetised temporarily.
- The magnetism produced in this way is called induced magnetism.
- A magnetic pole induces opposite polarity on the near end and similar polarity on the farther end of an iron bar.
3
3. Magnetic Field and Field Lines
- The space around a magnet in which the needle of a compass rests in a direction other than the geographic north-south direction is called the magnetic field of the magnet.
- Magnetic field is a vector quantity.
- The magnitude of magnetic field at a point is measured by the force experienced by a magnetic pole placed there.
4
4. Earth as a Magnet and Neutral Points
- The earth behaves like a huge bar magnet at its centre.
- The magnetic south pole of the earth lies near the geographic north, and the magnetic north pole lies near the geographic south.
- The magnetic axis of the earth makes an angle of 17° with the axis of rotation of the earth.
Get complete notes with diagrams and examples
Full NotesKey Concepts
Lodestone is an ore of ironBar magnetsA freely suspended magnet restsThe temporary magnetism acquired byA piece of iron is first
Frequently Asked Questions
What are the important topics in Megnetisam for ICSE Class 9 Physics?
Key topics in Megnetisam include Basic Ideas About Magnets, Induced Magnetism, Magnetic Field and Field Lines, Earth as a Magnet and Neutral Points. Study these first, then practise questions on each for Class 9 exams.
How should I revise Megnetisam for Class 9 exams?
Learn the core ideas first, then work through the 43 practice questions on Megnetisam. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Megnetisam
For serious students
Get the full Megnetisam chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for ICSE Class 9 Physics. Free to start, no card needed.