Ch 06 - Electromagnetic Induction12th Physics
CGS Unit of Magnetic Flux
What is the CGS unit of magnetic flux, and how is it mathematically related to the standard SI unit (Weber)?
What is the CGS unit of magnetic flux, and how is it mathematically related to the standard SI unit (Weber)?
Explanation:
- The CGS unit of magnetic flux is the Maxwell.
- Conversion Relation: .
- (Note: The dimensional formula for magnetic flux is ).
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Magnetic Flux
Magnetic Flux
State the mathematical formula for the magnetic flux through a plane of area A placed in a uniform magnetic field.
Variables & Units:
- = Magnetic flux (Weber, Wb or )
- = Uniform magnetic field vector (Tesla, T)
- = Area vector, directed along the outward normal to the surface ()
- = Angle strictly between the magnetic field vector and the area vector
Conditions/Notes:
- Magnetic flux is a scalar quantity.
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Methods of Varying Magnetic Flux
Based on the formula for magnetic flux (), what are the three distinct physical methods to actively change the flux and induce an EMF in a closed loop?
Based on the formula for magnetic flux (), what are the three distinct physical methods to actively change the flux and induce an EMF in a closed loop?
Methods to change flux:
- Changing B: Varying the strength or magnitude of the external magnetic field over time.
- Changing A: Altering the shape or physical size of the coil (e.g., shrinking, stretching, or pulling it into/out of the field) to change the effective area intercepting the field lines.
- Changing : Rotating the coil within the magnetic field to constantly alter the angle between the area vector and the magnetic field lines.
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Also in this chapter
36 more cards to study in Prism
- 4Electromagnetic Induction Phenomenon
- 5Faraday's Law of Induction
- 6Kinematic Requirement for Induction
- 7Motional Electromotive Force
- 8Lenz's Law of Polarity
- 9Lenz's Law and Conservation of Energy
- 10Current in a Moving Conductor Loop
- 11Force Required to Move a Conductor
- 12Microscopic Origin of Motional EMF
- 13Power Dissipated in Motional EMF
- 14Stationary Conductor in Changing Field
- 15Charge Flow and Flux Change
- 16Mutual Inductance (Induced EMF)
- 17Eddy Currents (Foucault Currents)
- 18Mutual Inductance of Co-axial Solenoids
- 19Minimising Eddy Currents in Cores
- 20Self-Inductance (Induced EMF)
- 21Applications of Eddy Currents
- 22Self-Inductance of a Long Solenoid
- 23Inductance and Flux Linkage
- 24Magnetic Energy Stored in an Inductor
- 25Magnetic Energy Density
- 26Electrical Inertia
- 27Instantaneous EMF of an AC Generator
- 28Maximum (Peak) EMF
- 29Integral Form of Faraday's Law
- 30AC Generator Principle
- 31Motional EMF of a Rotating Rod
- 32Structural Components of an AC Generator
- 33Terminal Velocity of a Falling Rod
- 34Coefficient of Coupling
- 35Combination of Inductors
- 36Commercial AC Frequencies & Construction
- 37Growth of Current in an L-R Circuit
- 38Classifications of Commercial Generators
- 39Migration of Birds and Electromagnetic Induction
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