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Torque on a Current-loop: Moving-Coil Galvanometer — Syllabus

ICSE · Class 12 · Physics

What Torque on a Current-loop: Moving-Coil Galvanometer covers in ICSE Class 12 Physics: 3 topics, for the 2026-27 session.

41 questions30 flashcards19 formulas & key relations5 concepts

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3 Topics · ICSE Class 12 Physics · 2026-27

Topics in Torque on a Current-loop: Moving-Coil Galvanometer

1

Torque on a Current Loop in a Uniform Magnetic Field

  • A closed current-loop placed in a uniform magnetic field experiences torque.
  • For a rectangular loop PQRS, the forces on sides PQ and RS are equal, opposite, and form a couple.
  • The forces on QR and SP cancel and do not contribute to torque.
2

Moving-Coil Galvanometer and Radial Magnetic Field

  • A moving-coil galvanometer detects and measures current using magnetic torque.
  • Its working depends on the deflecting torque on a current-carrying coil in a magnetic field.
  • Moving-coil galvanometers are of two types: suspended-coil galvanometer and pivoted-coil galvanometer.
3

Conversion of Galvanometer into Ammeter and Voltmeter

  • An ammeter is connected in series and should have ideally zero resistance.
  • A voltmeter is connected in parallel and should have ideally infinite resistance.
  • A galvanometer is converted into an ammeter by connecting a small shunt in parallel.

Key Concepts

Central concept: A current loop in a uniform magnetic field experiences torque, and this principle is used in moving-coil galvanometers, ammeters, and voltmeters.

Torque on a current loopMagnetic moment of a coilMoving-coil galvanometerGalvanometer sensitivityConversion of galvanometer into ammeterConversion of galvanometer into voltmeter

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Frequently Asked Questions

What are the important topics in Torque on a Current-loop: Moving-Coil Galvanometer for ICSE Class 12 Physics?
Key topics in Torque on a Current-loop: Moving-Coil Galvanometer include Torque on a Current Loop in a Uniform Magnetic Field, Moving-Coil Galvanometer and Radial Magnetic Field, Conversion of Galvanometer into Ammeter and Voltmeter. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Torque on a Current-loop: Moving-Coil Galvanometer for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 41 practice questions on Torque on a Current-loop: Moving-Coil Galvanometer. 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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