Eddy Current Flow (1 Viewer)

[DigitalFortress]

Hi,

I need some help understanding the direction of flow of an eddy current.

on pg 141 Physics HSC Rev1 i quote:

"The direction of the force on the eddy current can be detemined using the right hand push rule and it is always opposite to the direction of motion of the sheet"

They also have this image off to the side :

Now when i apply the right hand palm rule to the eddy current..from what I understand the sheet of metal should be moving to the left, not the right.
If this is correct, then the above quote is contradictory. Could someone please clarify this, would be greatly appreciated.

(half yearly on Wednesday >_< )

 

[zenger69]

"Now when i apply the right hand palm rule to the eddy current..from what I understand the sheet of metal should be moving to the left, not the right."

yes true except eddy currents (like Back EMF) are induced so they abide by Lenz's law and the Law of Conservation of Energy.

So the induced eddy currents oppose the flow of actual EMF (Voltage like a power). As the metal plate thing is moved across and the magnetic flux is changed..

So when you use your right hand palm rule, with your inside palm facing the movement of the metal, you show the actual EMF moving.
But since eddy currents oppose the change in flux (metal cutting field lines) which caused the induced EMF therefore it opposes it and goes the other way.

Hope it helps.

 

[DigitalFortress]

"Now when i apply the right hand palm rule to the eddy current..from what I understand the sheet of metal should be moving to the left, not the right."

yes true except eddy currents (like Back EMF) are induced so they abide by Lenz's law and the Law of Conservation of Energy.

So the induced eddy currents oppose the flow of actual EMF (Voltage like a power). As the metal plate thing is moved across and the magnetic flux is changed..

So when you use your right hand palm rule, with your inside palm facing the movement of the metal, you show the actual EMF moving.
But since eddy currents oppose the change in flux (metal cutting field lines) which caused the induced EMF therefore it opposes it and goes the other way.

Hope it helps.

Hey thanks man...helped heaps...
Now that you said that I re-read the article and it says that eddy currents work on the Lenz's law which basically reinstates what you said.