Hami Hashmi Posted October 15, 2018 Share Posted October 15, 2018 If the saturation of mu-metal was 0 and you had a box of it with wires wrapped around the box with a current passed through them (no external magnetic field) would the magnetic field be enhanced outside the box around the poles like this? Link to comment Share on other sites More sharing options...
Externet Posted October 16, 2018 Share Posted October 16, 2018 (edited) I would say the magnetic field will be contained and follow the mu-metal path with minimal field outside it. Your sketch should define/identify the colored sections to better understand you. Edited October 16, 2018 by Externet Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 16, 2018 Author Share Posted October 16, 2018 20 hours ago, Externet said: I would say the magnetic field will be contained and follow the mu-metal path with minimal field outside it. Your sketch should define/identify the colored sections to better understand you. Well in the sketch the red areas are the areas with highest field density. Link to comment Share on other sites More sharing options...
swansont Posted October 16, 2018 Share Posted October 16, 2018 20 hours ago, Externet said: I would say the magnetic field will be contained and follow the mu-metal path with minimal field outside it. That's basically what it shows. The ambient field is uniform, and with the shielding, the flux lines concentrate at the end as they bunch up in the material. Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 16, 2018 Author Share Posted October 16, 2018 2 minutes ago, swansont said: That's basically what it shows. The ambient field is uniform, and with the shielding, the flux lines concentrate at the end as they bunch up in the material. Even if the saturation was 0 the outside field would be similar? And if not, is there any possible way for a material (theoretical or otherwise) to dampen the magnetic field uniformly in this instance? Link to comment Share on other sites More sharing options...
swansont Posted October 16, 2018 Share Posted October 16, 2018 1 hour ago, Hami Hashmi said: Even if the saturation was 0 the outside field would be similar? And if not, is there any possible way for a material (theoretical or otherwise) to dampen the magnetic field uniformly in this instance? What do you mean by saturation is 0? Magnetic field lines have to make closed loops. That limits what you can do. Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 17, 2018 Author Share Posted October 17, 2018 (edited) 22 hours ago, swansont said: What do you mean by saturation is 0? Magnetic field lines have to make closed loops. That limits what you can do. Oh ok. I meant that if the actual mu-metal box had a saturation of 0 would it be able to dampen the field then. Would a box made out of magnetic monopoles be able to dampen the field? (I know they are theoretical). Edited October 17, 2018 by Hami Hashmi Link to comment Share on other sites More sharing options...
swansont Posted October 17, 2018 Share Posted October 17, 2018 1 hour ago, Hami Hashmi said: Oh ok. I meant that if the actual mu-metal box had a saturation of 0 would it be able to dampen the field then. Would a box made out of magnetic monopoles be able to dampen the field? (I know they are theoretical). What do you mean that that the saturation is 0? Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 18, 2018 Author Share Posted October 18, 2018 Ok nevermind about that but what if the box was made from a material that had very high permiability, very high saturation rate, a extremely low coercivity, near zero magnetostriction, and extremely large anisotropic magnetoresistance? Would it dampen the magnetic field uniformly then? Link to comment Share on other sites More sharing options...
swansont Posted October 19, 2018 Share Posted October 19, 2018 Basically the field is going to look like a dipole. The field has to end up obeying Maxwell's equations. An approximately uniform field from a single component is only going to arise if you are far away from the source, and looking at small areas. Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 20, 2018 Author Share Posted October 20, 2018 Ok. So the magnetic field will be enhanced around the poles? Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 21, 2018 Author Share Posted October 21, 2018 Sorry, will still be enhanced around the poles? Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 22, 2018 Author Share Posted October 22, 2018 Hi Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 25, 2018 Author Share Posted October 25, 2018 Ok, what if you wrapped the mu-metal in a layer of nonconducting material with the wires on top? What would happen then? Link to comment Share on other sites More sharing options...
swansont Posted October 26, 2018 Share Posted October 26, 2018 Really, what you need to do is find a simulator that will answer these questions, or, for the simplest geometries, solve the equations yourself. Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 26, 2018 Author Share Posted October 26, 2018 8 hours ago, swansont said: Really, what you need to do is find a simulator that will answer these questions, or, for the simplest geometries, solve the equations yourself. How would i find those simulators? And how would i use them to solve this question? Link to comment Share on other sites More sharing options...
swansont Posted October 27, 2018 Share Posted October 27, 2018 15 hours ago, Hami Hashmi said: How would i find those simulators? And how would i use them to solve this question? There is software that does this. I don't know if there are web-based calculators. One might use a search engine. You enter the geometry, parameters and boundary conditions. It does finite-element calculations. The picture I uploaded was the result of such software. Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 28, 2018 Author Share Posted October 28, 2018 Ok. So I type down magnetic field simulator? Link to comment Share on other sites More sharing options...
Hami Hashmi Posted October 29, 2018 Author Share Posted October 29, 2018 Is this one good? https://www.falstad.com/vector3dm/ And how do i simulate what i mentioned above? Link to comment Share on other sites More sharing options...
Hami Hashmi Posted November 1, 2018 Author Share Posted November 1, 2018 Like a magnetic shield surrounded by an electric insulator covering. Link to comment Share on other sites More sharing options...
Hami Hashmi Posted November 2, 2018 Author Share Posted November 2, 2018 (edited) How do i simulate it? I looked around but I couldnt find a way to do it. Edited November 2, 2018 by Hami Hashmi Link to comment Share on other sites More sharing options...
Hami Hashmi Posted November 5, 2018 Author Share Posted November 5, 2018 bump Link to comment Share on other sites More sharing options...
Strange Posted November 6, 2018 Share Posted November 6, 2018 I googled finite element simulation magnetic field and found a few examples: http://www.femm.info/wiki/HomePage https://quickfield.com/glossary/magnetic-simulation.htm https://uk.comsol.com http://getdp.info https://caelinux.com/CMS3/ I don't know if anyone of them will do what you want. Link to comment Share on other sites More sharing options...
Hami Hashmi Posted November 7, 2018 Author Share Posted November 7, 2018 ok thanks. Link to comment Share on other sites More sharing options...
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