Induced EMF in Non-Uniform Magnetic Field

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Homework Help Overview

The discussion revolves around the induced electromotive force (emf) in a square wire loop moving through a non-uniform magnetic field. The loop's dimensions and the magnetic field's orientation and strength are specified, along with the loop's velocity. Participants explore the implications of the loop's position relative to the magnetic field and the resulting induced emf.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the use of formulas such as E=Blv and the concept of motional emf. There are questions about how to determine the polarity of induced emf and the effects of the magnetic field on different parts of the loop as it moves through the field.

Discussion Status

Some participants have provided guidance on using the force on a charge in a magnetic field to determine the direction of induced emf. Others express confusion about the calculations and the relationship between magnetic flux and induced emf, indicating a lack of consensus on the approach to take for specific cases.

Contextual Notes

Participants mention the need for a diagram to better understand the problem setup. There are also references to the complexity of the situation due to the loop's movement through areas of varying magnetic field strength.

  • #31
haha i know, but i don't really know how i got it. i just kinda guessed because all else failed. it doesn't make sense to me... half was in the + B-field and half was in the - B-field I would just think that they'd cancel out and it would equal 0.
 
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  • #32
The flux through the loop is indeed 0, but the emf doesn't depend on the flux but on the rate of change of the flux. That's what you need to calculate.
 
  • #33
does it have anything to do with how that person was talking abour charges? like how the left side say wants to pull more to the left and the right side wants to pull more towards the right and so that puts twice the change on it ?
 
  • #34
hello, what is the difference between the flux density of air gap and iron in magnetic circuit.
let say i have an iron ring with an air gap of 1mm. do the air gap and iron ring produce the same magnitude of flux density and flux.
 

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