Magnet Myths and Misconceptions

[tinman]

Tinman,

Do you know of a conductor that can carry current and yet produce no magnetic field?

PW

First up, forgive me if I make typeos, as im on my phone, and the letters are quite small.just waiting to be unloaded here, so took the opertunaty to throw in some questions.

I think I'll stick to asking questions for a while here PW.
So do you think such a conductor exist?
If we had such a conductor that could carry current but produced no magnetic field around it, what would be the outcome if we used this conductive material as the secondary winding on a transformer?

[picowatt]

First up, forgive me if I make typeos, as im on my phone, and the letters are quite small.just waiting to be unloaded here, so took the opertunaty to throw in some questions.

I think I'll stick to asking questions for a while here PW.
So do you think such a conductor exist?
If we had such a conductor that could carry current but produced no magnetic field around it, what would be the outcome if we used this conductive material as the secondary winding on a transformer?

Tinman,

As I cannot imagine a conductor that does not produce a magnetic field while passing current, that's a tough question. 

I can envision configurations of conductors that DO create magnetic fields while passing current that are so arranged to cancel their fields and present the appearance of producing no measurable magnetic field.

However, as I cannot imagine a conductor that does not produce a magnetic field while passing current, it is just as difficult to imagine how that "special" conductor would respond to a changing magnetic field if utilized in the secondary of a transformer.

PW

[tinman]

Tinman,

As I cannot imagine a conductor that does not produce a magnetic field while passing current, that's a tough question. 

I can envision configurations of conductors that DO create magnetic fields while passing current that are so arranged to cancel their fields and present the appearance of producing no measurable magnetic field.

However, as I cannot imagine a conductor that does not produce a magnetic field while passing current, it is just as difficult to imagine how that "special" conductor would respond to a changing magnetic field if utilized in the secondary of a transformer.

PW

If such a conductor did exist, and was used as the secondary in a transformer, I see only 2 possible outcomes.
1-it wouldnt produce any current
2-it would produce current without reflecting on the primary.

It's a bit of a conundrum really, if it conducts , then induction should happen. But I believe that for induction to occur in the secondary, there needs to be a CEMF.

Now, just to throw a bit more in the mix, what if we had a conductor that produced the opposite field to that of say copper, while maintaining the same current flow direction?

You may think thses are nonsense questions, but I am serching here for those that can think outside the box. Maybe some one has found such conductors, but have not been gaim to tell us about there discovery for fear that the bullshit button will be hit, and they get to bask in the posts full of ridicule.

[MarkE]

Tinman:

What is the basis for you posing that question?  Any wire that has current flowing through it will have a magnetic field around it.  In fact there is even a magnetic field inside the wire.  That leads into a related question.  What is the simplest inductor?  The answer is a short length of straight wire.

It makes me think of when people post things like, "I tested my coils with copper magnet wire and now I am going to test them with iron wire."  The participants in the thread will wait for the results of the test.  If you ignore the slightly different resistances of the two wires, then there is no possible difference between a coil made with copper wire and coil made with iron wire.

That is not quite correct.  An iron wire will because of its permeability have a denser concentration of flux in the wire.  The skin depth will be different due to both the difference in resistivity and permeability.  Higher resistance drives the skin depth higher, while higher permeability drives it lower.

It's the same frustration that I couldn't really give a rat's ass about any more.  What does it take to become a master machinist?  Perhaps three or four years of school and then three or four years of apprenticeship?  Do you think a Jow Blow off the street can just watch a few YouTube clips and then start working in a factory machining aircraft engine parts?  Why in God's name do people think they can buy a scope and a multimeter and then research free energy machines?  You saw Chris fall flat on his face because he couldn't solve a circuit that consisted of one lousy component.  Now he has his own thread to teach people how to build allegedly over unity transformers.

MileHigh

[MarkE]

So where there is current flow there is a magnetic field regardless of what carries that current?

Yeppers.  Moving charge <=> magnetic field.

Mark-What if there was a conductor that can carry current, but no magnetic field is produced around that conductor

Can doesn't count.  Current counts.  And please don't confuse overlapping but opposing fields with no field.