Magnet Myths and Misconceptions

[EMJunkie]

NoBull - I think you have missed the last 15 or so posts. We have done this experiment already. My last post explains why we still have not got an conclusive result.

[MileHigh]

I am posting a picture of aerogel as an analogy to what a magnetic field is like around a magnet.  Forget about the shape, that's not the issue.  The aerogel sort of looks like a cloud of varying density.  Even though the aerogel is of uniform density, with a bit of imagination it looks like it is a cloud of varying density.

You look at the picture and you can imagine the denser parts are like the stronger parts of a magnetic field around a hypothetical magnet that you can't see at the center.  The further you are away from the magnet, the less dense and more wispy the cloud gets, indicating a weaker magnetic field.  Far enough away and the field is so weak that you can't see it anymore, but it is still there.

And for the closed-loop spaghetti strands, they are all there in the sense that if you followed the direction of the magnetic field in the cloud, you would follow the closed loops.  There is an infinity of closed-loop paths in the cloud.

The main point that has been mentioned before, is that there are no "lines of flux to cut."  The "lines" only exist on paper diagrams to help us visualize what is going on.  Typically lines closer together indicate a stronger magnetic field and lines farther apart indicate a weaker magnetic field.

[EMJunkie]

@Chris


I'm glad you jumped in with some suggestions and I made some plots which actually surprised me a bit. I didn't realize how far out the polarity transitions from the North face north polarity to the smaller transition to a South polarity on these magnets along the plane of the pole.
As well as didn't expect the result with the hall sensor facing the side of the magnet at the center. I expected some very small deviation however it was zero from the side to 10" out.


Interesting.


AC

@AC - I too am glad you jumped in and also brought a fresh Mind to this debate!

Thanks for joining in!

Kind Regards

  Chris

[Pirate88179]

Very nicely worded but still you have NO Legs to stand on! Evidence again is not on your side! You have lost your Compass Race and been shot down, that Big Orange is still sitting beside you and you still refuse to prove it doesn't exist!

I have watched all of Dr. Lewin's lectures available online.  He is a brilliant physicist and teacher. Never once did I ever hear him mention a bloch wall at the equator or on a bar magnet.  So, when you say Chris that he backs you up you are not being genuine.

Bill

[Magluvin]

@Chris


I'm glad you jumped in with some suggestions and I made some plots which actually surprised me a bit. I didn't realize how far out the polarity transitions from the North face north polarity to the smaller transition to a South polarity on these magnets along the plane of the pole.
As well as didn't expect the result with the hall sensor facing the side of the magnet at the center. I expected some very small deviation however it was zero from the side to 10" out.


Interesting.


AC

Hey AC

Back some years ago at Fizzx.com  now .org, we were discussing possibilities of the field being comprised of particles and the particles having a direction of flow, N to S or S to N.  And in part of the discussion was about how particles would flow out, as compared to how the would flow in. As in, if the particles were affected by inertia.  Say the particles were the tiniest kind. Pass by an atom, even through, and they traveled at a particular speed(very very fast), imagine ones that are exiting say the N face of the mag and not having such a curvature as to the ones being say pulled in by the S pole face.  There was more to it all. But what you guys are showing brought back memories of those times.

One thing. Is it the same result with any magnet?  Only because I went through a terrible experience where the magnets I was working with were not evenly magnetized. Off center, different magnetic strength of the same batches, and possibly tighter field on one pole face and more of a spread on the other face. As if it was one of the faces that was concentrated and the other side, even the sides of the edges wer showing as much field as the face, more of a bloom than the other pole.  You have to buy many many magnets to get close to having matched sets. Electro magnets are much more consistent. If some out there are building devices with many magnets of the same type, the best efficiency of the whole would be to have matched sets.   Lets say someone had a nice idea for an all magnet motor, and were really looking for the smallest hint of self runners, then there is a possibility that just 1 mag of the bunch could be screwing things up, and might miss out on the gold. If some are serious about what you are building, then carefully choose and make matched sets. Especially when balance all around is critical.

Nice experiments guys.

Mags