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Magnetism And Electromagnetism — Syllabus

Tamil Nadu Board · Class 9 · Science

What Magnetism And Electromagnetism covers in Tamil Nadu Board Class 9 Science: 4 topics, for the 2026-27 session.

42 questions25 flashcards5 concepts

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A diagram showing the setup of Oersted's experiment with a straight copper wire, a battery, a key, and a compass needle placed near the wire, illustrating the deflection of the compass when current fl
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4 Topics · Tamil Nadu Board Class 9 Science · 2026-27

Topics in Magnetism And Electromagnetism

1

Magnetic Field and Magnetic Field Lines

  • A magnetic field is the region around a magnet where its influence (attraction or repulsion) can be felt.
  • Magnetic field is denoted by B and its SI unit is Tesla (T).
  • Magnetic field lines are imaginary curved lines used to represent the magnetic field visually.
2

Magnetic Effect of Current – Oersted's Discovery

  • Hans Christian Oersted (Danish physicist) discovered in 1820 that a current-carrying conductor produces a magnetic field around it.
  • He noticed that a compass needle near a current-carrying wire deflected when the circuit was switched on and off.
  • This discovery proved that electricity and magnetism are related – leading to the birth of electromagnetism.
3

Force on a Current-Carrying Conductor in a Magnetic Field

  • H.A. Lorentz discovered that a moving charge in a magnetic field (not parallel to it) experiences a force called Magnetic Lorentz Force.
  • Since moving charges constitute current, a current-carrying conductor in a magnetic field also experiences a force.
  • Michael Faraday (1821) showed experimentally that a current-carrying conductor placed in a magnetic field gets deflected.
4

Force Between Two Parallel Current-Carrying Conductors

  • A current-carrying conductor has a magnetic field around it.
  • When two current-carrying conductors are placed parallel to each other, each conductor is in the magnetic field of the other.
  • Each conductor experiences a force due to the magnetic field of the other conductor.

Key Concepts

A magnetic field is the regionMagnetic field lines are imaginary curvesMagnetic flux represents the total numberIn 1820This rule helps determine the direction

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Frequently Asked Questions

What are the important topics in Magnetism And Electromagnetism for Tamil Nadu Board Class 9 Science?
Key topics in Magnetism And Electromagnetism include Magnetic Field and Magnetic Field Lines, Magnetic Effect of Current – Oersted's Discovery, Force on a Current-Carrying Conductor in a Magnetic Field, Force Between Two Parallel Current-Carrying Conductors. Study these first, then practise questions on each for Class 9 exams.
How should I revise Magnetism And Electromagnetism for Class 9 exams?
Learn the core ideas first, then work through the 42 practice questions on Magnetism And Electromagnetism. 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.

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All Tamil Nadu Board Class 9 Science Syllabus

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