Bar moving in a magnetic field.

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Discussion Overview

The discussion revolves around a problem involving a bar moving in a magnetic field, focusing on the equations and principles that apply to the scenario. Participants explore the derivation of the relevant equations and the application of electromagnetic principles.

Discussion Character

  • Homework-related
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant expresses difficulty in identifying the correct equation to solve the problem and references a previous example from a lecturer.
  • Another participant suggests deriving the equation using physics principles and inquires about the mechanical and electrical aspects of the problem, as well as applicable laws.
  • One participant claims to have solved the problem using the equation Emf = BLV and calculates the velocity based on given values, questioning the correctness of their solution.
  • A later reply provides a link to a resource that may contain the lesson the first participant is missing.
  • The same participant reiterates their solution and receives affirmation from another participant, who states that using the equation works even when Maxwell's equations do not apply.

Areas of Agreement / Disagreement

While there is some agreement on the use of the equation Emf = BLV, the discussion includes varying levels of confidence in the calculations and interpretations of the problem, indicating that multiple views remain on the correctness of the solution.

Contextual Notes

Participants do not clarify certain assumptions or dependencies in their calculations, and there are unresolved steps in the mathematical reasoning presented.

DannyBoy27
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I have attached a copy of the question I am having issues with, I can't seem to figure out the equation I have to use to solve this. My lecturer did an example of this but for some reason I can't find it anywhere.
 

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If you cannot figure out the equation - use physics instead, and derive the equation.
What is happening, mechanically and electrically, in the problem?
What sort of law will apply here?
 
I think I solved the problem. Emf = BLV. And we know that emf will be equal to IR when the current is 0.5A.

0.5 x 9 = 4 x 1.2 x V

Therefore the velocity equals 0.9375 m/s.

Is this correct?
 
DannyBoy27 said:
I think I solved the problem. Emf = BLV. And we know that emf will be equal to IR when the current is 0.5A.

0.5 x 9 = 4 x 1.2 x V

Therefore the velocity equals 0.9375 m/s.

Is this correct?

Yes.
Good.
Using Blv works even when Maxwell's equations don't!
 

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