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Torque on a Current-loop: Moving-Coil Galvanometer — Concept Maps

ICSE · Class 12 · Physics

4 concept maps of Torque on a Current-loop: Moving-Coil Galvanometer for ICSE Class 12 Physics, each also written out as a text outline.

41 questions30 flashcards19 formulas & key relations5 concepts

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4 Concept Maps

Chapter Overview: Torque on Current-loop and Moving-Coil Galvanometer

Chapter Overview: Torque on Current-loop and Moving-Coil Galvanometer

The map in words

  • Torque and Galvanometer
    • Torque on Current Loop
      • Formula tau = NIAB sinTheta
      • Net force = zero
      • Max torque at theta = 90 deg
      • Zero torque at theta = 0 deg
      • Vector form tau = m cross B
      • Magnetic Moment m = NIA
    • Moving Coil Galvanometer
      • Types
        • Suspended Coil
          • Phosphor bronze strip
          • Lamp and scale
          • Sensitivity 10 power minus 9 A
        • Pivoted Coil Weston
          • Pointer on circular scale
          • Sensitivity 10 power minus 6 A
          • Portable
      • Key Parts
        • Concave pole pieces
        • Soft iron core
        • Radial field created
      • Working Principle
        • NIAB = c phi
        • I proportional to phi
        • Linear scale
    • Sensitivity
      • Current Sensitivity Sc = NAB divided by c
      • Voltage Sensitivity Sv = NAB divided by cR
      • Figure of Merit = I divided by phi
      • Increasing Sensitivity
        • Increase N
        • Increase A
        • Increase B
        • Decrease c
    • Ammeter Conversion
      • Shunt S in parallel
      • S = Ig times G divided by I minus Ig
      • RA = GS divided by G plus S
      • Ideal resistance = zero
    • Voltmeter Conversion
      • High resistance R in series
      • R = V divided by Ig minus G
      • RV = G plus R
      • Ideal resistance = infinite

Chapter Content Overview - Torque on Current Loop and Galvanometer

Chapter Content Overview - Torque on Current Loop and Galvanometer

The map in words

  • Torque on Current Loop Moving-Coil Galvanometer
    • Torque Fundamentals
      • Force on Conductors
        • Magnetic Force Law
        • Fleming's Left-Hand Rule
      • Torque on Rectangular Loop
        • Deflecting Torque
        • Equilibrium Condition
      • Magnetic Moment
        • Definition m = NIA
        • Vector Form
    • Galvanometer Design
      • Construction
        • Suspended-Coil Type
        • Pivoted-Coil Type
      • Radial Magnetic Field
        • Cylindrical Pole Pieces
        • Soft-Iron Core
        • Linear Deflection
      • Suspension System
        • Torsional Constant
        • Restoring Torque
    • Sensitivity Analysis
      • Current Sensitivity
        • Definition and Formula
        • Affecting Factors
      • Voltage Sensitivity
        • Definition and Formula
        • Relationship to Current Sensitivity
      • Figure of Merit
    • Instrument Conversions
      • Ammeter Conversion
        • Shunt Connection
        • Shunt Resistance Formula
        • Current Division
      • Voltmeter Conversion
        • Series Resistance
        • Multiplier Calculation
        • Voltage Division
    • Applications
      • Electrical Measurements
      • Null Point Detection
      • Motor Principle
      • Power Generation

Torque on Current-Loop and Galvanometer - Concept Overview

Torque on Current-Loop and Galvanometer - Concept Overview

The map in words

  • Torque on Current-Loop and Galvanometer
    • Torque on Current-Loop
      • Formula tau = NIAB sinTheta
      • Magnetic Moment m = NIA
      • Vector Form tau = m cross B
      • Maximum Torque
        • When sinTheta = 1
        • Plane parallel to field
      • Zero Torque
        • When sinTheta = 0
        • Plane perpendicular to field
      • Applications
        • Electric Motors
        • Galvanometers
    • Moving-Coil Galvanometer
      • Types
        • Suspended-Coil
          • Phosphor-bronze strip
          • Lamp and scale
          • High sensitivity
        • Weston
          • Spiral springs
          • Pointer on dial
          • Portable design
      • Key Features
        • Radial Magnetic Field
          • Concave pole-pieces
          • Soft-iron core
          • Linear response
        • Equilibrium
          • NIAB = c phi
          • I proportional to phi
      • Sensitivity
        • Current Sensitivity
          • Sc = NAB over c
          • rad per ampere
        • Voltage Sensitivity
          • Sv = NAB over cR
          • rad per volt
        • Factors
          • Increase N, A, B
          • Decrease c
    • Conversions
      • To Ammeter
        • Add shunt S parallel
        • Low resistance
        • Series connection
        • Formula S = Ig over (I-Ig) times G
      • To Voltmeter
        • Add resistance R series
        • High resistance
        • Parallel connection
        • Formula R = V over Ig minus G

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

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

The map in words

  • 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 loop
    • Magnetic moment of a coil
    • Moving-coil galvanometer
    • Galvanometer sensitivity
    • Conversion of galvanometer into ammeter
    • Conversion 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.
What do the concept maps for Torque on a Current-loop: Moving-Coil Galvanometer show?
The 4 maps show how the ideas in Torque on a Current-loop: Moving-Coil Galvanometer connect: Chapter Overview: Torque on Current-loop and Moving-Coil Galvanometer; Chapter Content Overview - Torque on Current Loop and Galvanometer. Each map is also written out as an outline on this page.
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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