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Chapter Summary

Torque on a Current-loop: Moving-Coil Galvanometer

ICSE · Class 12 · Physics

Summary of Torque on a Current-loop: Moving-Coil Galvanometer for ICSE Class 12 Physics. Key concepts, important points, and chapter overview.

41 questions30 flashcards5 concepts

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Overview

A closed current-loop placed in a uniform magnetic field experiences a torque. This torque is the basis of the working of galvanometers as well as electric motors. The chapter connects the torque on a current loop with the working principle, construction, sensitivity, and practical conversion of mov

Key Concepts

Each side of a rectangular current

Each side of a rectangular current loop in a uniform magnetic field experiences force. The forces on the two vertical sides are equal and opposite but

The magnetic moment of a coil

The magnetic moment of a coil is m = NIA, directed along the area vector normal to the plane of the coil. Its SI unit is A m^2. The torque can be writ

Torque is maximum when the plane

Torque is maximum when the plane of the coil is parallel to the magnetic field, so θ = 90° and τ_max = NIAB. Torque is zero when the plane of the coil

A moving

A moving-coil galvanometer detects and measures current by the deflection produced when a current-carrying coil is placed in a magnetic field. Its act

Moving

Moving-coil galvanometers are of two types: suspended-coil galvanometer and pivoted-coil (Weston) galvanometer. The suspended type has the coil suspen

Learning Objectives

  • Understand the torque experienced by a current loop in a uniform magnetic field.
  • Derive the torque on a planar current loop and relate it to magnetic moment.
  • Explain the working and construction of moving-coil galvanometers.
  • Compare suspended-coil and pivoted-coil galvanometers.
  • Understand the idea of radial magnetic field and why it improves linearity.

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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