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Magnetic Classification of Substances

ICSE · Class 12 · Physics

Quick revision notes for Magnetic Classification of Substances — ICSE Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.

44 questions28 flashcards5 concepts

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Key Topics to Revise

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1. Classification of Magnetic Substances

  • All substances, including solids, liquids, and gases, fall into diamagnetic, paramagnetic, or ferromagnetic classes.
  • Every substance is fundamentally diamagnetic, but in paramagnetic and ferromagnetic substances this property is masked by the stronger magnetic effect.
  • Diamagnetic substances are feebly magnetised opposite to the magnetising field and are repelled by a magnet.
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2. Magnetic Induction, Magnetisation, and Magnetic Intensity

  • Magnetic induction B is the magnetic flux density inside a magnetised substance.
  • SI unit of B is tesla; CGS unit is gauss, and 1 G = 10^-4 T.
  • Magnetisation M is the magnetic moment per unit volume of a magnetised substance.
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3. Properties of Dia-, Para-, and Ferromagnetic Substances

  • A freely suspended diamagnetic rod sets itself perpendicular to the magnetic field.
  • A freely suspended paramagnetic rod sets itself parallel to the magnetic field.
  • A diamagnetic substance moves from stronger to weaker regions of a non-uniform magnetic field.
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4. Atomic Explanation of Magnetism

  • Electron spin is the main source of atomic magnetic moment; orbital motion contributes very little.
  • Diamagnetic substances generally have atoms, ions, or molecules with paired electrons and zero net magnetic moment.
  • When a diamagnetic substance is placed in a field, the induced moment is opposite to the field because of the Lenz-law effect.

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Full Notes

Key Concepts

These substances are feebly magnetised oppositeThese substances are feebly magnetisedThese substances are strongly magnetisedMagnetic induction is the magnetic fluxMagnetic intensity measures the capability

Frequently Asked Questions

What are the important topics in Magnetic Classification of Substances for ICSE Class 12 Physics?
Key topics in Magnetic Classification of Substances include Magnetic Classification of Substances - Concept Overview, Mind map showing the three main classifications of magnetic substances and their key characteristics with examples, Flowchart showing the mechanism of diamagnetism from atomic structure to macroscopic repulsion. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Magnetic Classification of Substances — ICSE Class 12 Physics?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and 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.

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