Induced emf graph vs Magnetic flux (1 Viewer)

[sonnylongbottom]

When is induced emf maximum and minimum? this always confuses me thanks

 

[helper]

REmember Faraday's Law

Its the change in flux that is important no the magnitude of it. So whenever the change of flux is a maximum, the EMF is a maximum.

So for a normal gnereator, when the flux is a maximum, the change in flux is a minimum and so is the EMF.
Think of what is the slope of the line, when looking at a graph of flux versus time.

 

[dolbinau]

when the EMF is a maximum, the change in flux is a minimum and so is the EMF.

You are saying EMF is maximum and EMF in the same instance , typo?

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This kind of confuses me too. I just remember Induced current is opposite to the change in flux graph..(which makes sense I think since induced current opposes the change)

 

[helper]

You are saying EMF is maximum and EMF in the same instance , typo?

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This kind of confuses me too. I just remember Induced current is opposite to the change in flux graph..(which makes sense I think since induced current opposes the change)

Yep TYPO, fixed up.

 

[adnan91]

Yes emf = change in flux / change in time

But to answer ur question! flux = magnetic field (B) x AREA. So Due to the directly proportional relationship the greater the area the greater hte emf

 

[helper]

Yes emf = change in flux / change in time

But to answer ur question! flux = magnetic field (B) x AREA. So Due to the directly proportional relationship the greater the area the greater hte emf

That is wrong. Look at the standard graph

The change in flux at the maximum flux is zero and no EMF. Think of the slope at the point.

 

[sonnylongbottom]

so EMF is maximum, when the flux is parallel to magnetic field? i.e when flux is minimum?

 

[helper]

so EMF is maximum, when the flux is parallel to magnetic field? i.e when flux is minimum?

EMF is minimum when perpendicular to the magnetic field for a standard generator. Look at the picture in my earlier post.

 

[ashbashness]

easiest way to think of it is that the change from 0 flux to any flux is pretty much infinite. then you find the place with 0 flux (ie parallel to the field) and voila, that's the place with highest emf.