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Could some of you do some quick experiments to see exactly what the results are?

thanks

- Thread starter crx
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- #1

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Could some of you do some quick experiments to see exactly what the results are?

thanks

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Even if you have two coils made of one single loop each, put close together (same axis) and if there is a rising current in one loop the induced current sould have the same dirrection (in phase). And of course there is a repulsive force too. Everywhere i searched they showed that the induced current is opposing the inductor current, and in this way you could explain the repulsive force as two opposing currents interraction. But my observations are differnt than those...so probably im doing something wrong....

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According to this it does cause the emf to travel in the opposite direction. Strange.

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html

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Drakkith

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Isn't the induced current caused by the magnetic field or flux? The motion of the current is getting energy from the flux and is opposing it by taking energy from it to move. Or at least thats what I got from my reading.Acording to this an induced current is opposig the original (inductor) current (180 phase shift)..

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This is what i learned in school me too... that the induced current will produce a magnetic flux that will oppose the inductor flux... I just wanted to see myself how this stuff works in reality and i observed that both currents will produce a magnetic flux of the same orientation...One of the most simple and obvious way to check this phenomen is by considering induction between two parallel conductors..Isn't the induced current caused by the magnetic field or flux? The motion of the current is getting energy from the flux and is opposing it by taking energy from it to move. Or at least thats what I got from my reading.

I know that this its considered by most of us a well studied phenomena, but is the least understood and the one reason for this is that we cannot comprehend why the induced current is in opposite direction...

When we slide a permanent magnet on a nonferomagnetic conductor surface we can see exactly that there is a force opposing movement so we guess that the Eddy current with its magnetic field should oppose the permanent magnet's field, but is this the reality? I would like to know...

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This is not quite right but it is a common point of confusion.This is what i learned in school me too...that the induced current will produce a magnetic flux that will oppose the inductor flux...I just wanted to see myself how this stuff works in reality and i observed that both currents will produce a magnetic flux of the same orientation...One of the most simple and obvious way to check this phenomen is by considering induction between two parallel conductors..

I know that this its considered by most of us a well studied phenomena, but is the least understood and the one reason for this is that we cannot comprehend why the induced current is in opposite direction...

When we slide a permanent magnet on a nonferomagnetic conductor surface we can see exactly that there is a force opposing movement so we guess that the Eddy current with its magnetic field should oppose the permanent magnet's field, but is this the reality? I would like to know...

The induced flux will oppose the

If the inductor flux is decreasing, the induced one will be in the same direction.

It direction of the currents depends on geometry.

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Drakkith

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Lenz law is not about electrons or the mechanism that produces the current. It is a simple way to determine the direction of the induced field and induced current. The induced field can add up to the original field (when this last one decreases) or subtract from it (when it increases).

When you suddenly turn off the current through a coil with large inductance, the induced current is in the same direction as the original one and can be much larger.

When you suddenly turn off the current through a coil with large inductance, the induced current is in the same direction as the original one and can be much larger.

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Salut Nasu!Lenz law is not about electrons or the mechanism that produces the current. It is a simple way to determine the direction of the induced filed and induced current. The induced field can add up to the original filed (when this last one decreases) or subtract from it (when it increases).

When you suddenly turn off the current through a coil with large inductance, the induced current is in the same direction as the original one and can be much larger.

Exactly this is what i realized after i checked this out on my own ..Its very sad that most of the information regardind this is faulty.. Look any website (or even some school books) about this subject. Even if they give the right interpretation of the law ("oposing the variation of the flux" ...right now I'm thinking that superconducting levitation shows well this effect ...) so when they about to show a drawing that will be most of the time wrong....

So the verdict is that the induced current in two paralell conductors will have the same direction as the inductor current .

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Salut Crx.So the verdict is that the induced current in two paralell conductors will have the same direction as the inductor current .

If you mean the current induced by one current carrying conductor in a second conductor, the verdict is: it depends. It depends on what the induced current is doing. If the current in the first wire is constant, there is no induced current. If the current increases or decreases there will be an induced current whose direction depends on what exactly the first current is doing: increasing or decreasing. The currents may have the same direction in one case and opposite in the other. Which on is which depends on geometry.

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