Which Method to Use for Calculating Induced EMF: Flux Rule or Lorentz Force?

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Discussion Overview

The discussion revolves around the methods for calculating induced electromotive force (EMF), specifically comparing the flux rule and the Lorentz force approach. Participants explore the conditions under which each method may be preferable, considering various geometrical configurations and available data.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant suggests using the flux rule (-d(magnetic flux)/dt) or the Lorentz force line integral to calculate EMF, seeking guidance on when to apply each method.
  • Another participant notes that the choice depends on the geometry of the problem and the data available, indicating that if the area of a closed loop is known and the corresponding flux can be easily calculated, the flux rule may be preferable.
  • Some participants reiterate the need for a guideline to determine the appropriate method to use, expressing uncertainty about the existence of any official recommendations.

Areas of Agreement / Disagreement

Participants generally agree that the choice of method depends on the specific geometry and data of the problem. However, there is no consensus on a definitive guideline for when to use each method.

Contextual Notes

Limitations include the lack of specific guidelines or official references regarding the choice between the two methods, as well as potential dependencies on the definitions and assumptions related to the geometry of the problems discussed.

Ahmad Kishki
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to calculate emf i can use the flux rule -d(magnetic flux)/dt or the lorentz force line integral across the circuit. Is there a gudeline to follow for knowing when to use either (or both) of these methods?

Thanks :D
 
This depends on the geometry in the problem and data you know. For instance, in cases where you know area of a closed loop and can easy calculate coresponding flux it is better to use dΨ/dt.
 
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zoki85 said:
This depends on the geometry in the problem and data you know. For instance, in cases where you know area of a closed loop and can easy calculate coresponding flux it is better to use dΨ/dt.

But is there a guideline?
 
Ahmad Kishki said:
But is there a guideline?
I don't know of any official read regarding this matter.
 

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