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Torque on a Current-loop: Moving-Coil Galvanometer

ICSE · Class 12 · Physics

Complete topic list for Torque on a Current-loop: Moving-Coil Galvanometer in ICSE Class 12 Physics. Key concepts, sub-topics, and what to focus on for board exams.

41 questions30 flashcards5 concepts

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3 Topics · ICSE Class 12 Physics

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

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 Chapter Overview: Torque on Current-loop and Moving-Coil Galvanometer, Chapter Content Overview - Torque on Current Loop and Galvanometer, Torque on Current-Loop and Galvanometer - Concept Overview. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Torque on a Current-loop: Moving-Coil Galvanometer — ICSE Class 12 Physics?
Understand the core concepts first, then work through the 41 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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