Maximum EMF - parallel to field?

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Discussion Overview

The discussion centers on the behavior of induced electromotive force (EMF) in a rotating coil within a uniform magnetic field, specifically addressing why the EMF is considered maximum when the coil is parallel to the magnetic field, resulting in zero flux linkage.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions why the EMF is maximum when the coil is parallel to the magnetic field, noting that this position corresponds to zero flux linkage.
  • Another participant states that induced EMF is defined as the rate of change of flux linkage, suggesting that this rate is greatest when the coil is passing through the parallel position.
  • A further reply reiterates the point about the rate of change of flux linkage being greatest at the parallel position, seeking clarification on this reasoning.
  • One participant explains that the change in flux linkage is rapid when moving from zero to a non-zero value in a short time frame, contrasting this with the situation at 90 degrees where the change is minimal over the same time interval, although they acknowledge the lack of rigorous mathematical backing.
  • A later reply expresses agreement with the previous explanation, indicating understanding.
  • Another participant adds a brief acknowledgment of the previous points made.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the relationship between coil orientation and induced EMF, with some points of agreement on the mechanics of flux linkage changes, but no consensus is reached on the underlying reasons.

Contextual Notes

Some participants note the lack of rigorous mathematical justification for the claims made, indicating potential limitations in the explanations provided.

jsmith613
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for a rotating coil in a uniform magnetic field, why is the EMF maximum when the coil is PARALLEL to the field (i.e: flux linkage = 0)
 
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Induced emf = rate of change of flux linkage. This is greatest when the coil s passing through the parallel position
 
truesearch said:
Induced emf = rate of change of flux linkage. This is greatest when the coil s passing through the parallel position

why?
 
Well...it goes from zero to something in a short space of time whereas when it is at 90degrees in the same space of time it doesn't change much...not very rigorous maths
 
truesearch said:
Well...it goes from zero to something in a short space of time whereas when it is at 90degrees in the same space of time it doesn't change much...not very rigorous maths

of corse..thanks :)
 
Of course...js...of course
 

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