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Torque on a Current-loop: Moving-Coil Galvanometer — Chapter Summary

ICSE · Class 12 · Physics

Summary of Torque on a Current-loop: Moving-Coil Galvanometer for ICSE Class 12 Physics. Part of the ICSE Class 12 Physics syllabus.

41 questions30 flashcards19 formulas & key relations5 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 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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