Magnetic Field from a Helmholtz Coil

[@montsecruz9301]

I needed to understand the way that the Helmholtz Coil works and in this video is beautifully explained, thank you from Mexico

[@arthurremington6703]

i realize Im pretty randomly asking but do anyone know a good website to watch newly released tv shows online?

[@gordonrichard8555]

@Arthur Remington Try FlixZone. Just google for it :)

[@kaisercastiel9703]

@Gordon Richard definitely, have been watching on FlixZone for since april myself =)

[@jairomarcelo3047]

@Gordon Richard Thank you, I signed up and it seems like they got a lot of movies there :D Appreciate it!!

[@bensonkayden9346]

@Arthur Remington No problem :)

[@dominicestebanrice7460]

FANTASTIC exposition. The best of the many Helmholtz coil videos out there. Thank you SO much! It would be so awesome to build on this exact foundation to (a) show how to calculate the magnetic FLUX through an area positioned at Zo and perpendicular to the coils, and then (b) calculate the magnetic FORCE on a small metal object placed at Zo. The units of measure between magnetic field, flux and force are SO confusing - a couple of videos sorting this out would get massive response I expect.

[@cosmolearner5562]

The most favourite physics channel

[@ruvik2508]

Wow just great... Need that kind of knowledge for my final exams in physics and in the language from the country I live in, which is Germany, I couldn't find one good video which explains this kind of stuff. Searching for it in english: A guy named "Physics Ninja" made a 23 minute long video about it with good quality and pictures that are easy to understand... Thank you, man!

[@PhysicsNinja]

Thanks for watching

[@victorreis5799]

Greetings from UFSCAR Physics Course, Brazil. Great lecture, you saved my homework!! Thanks a lot

[@jackdawsonanderson8285]

Really gonna help me in understanding my physics lab. Thanks much!

[@qwerty-gc8tn]

which semester is this physics lab?

[@jackdawsonanderson8285]

@@qwerty-gc8tn 2nd semester

[@yarilenkageraldinebenitesm4400]

Good evening Sir. I was needing this video so much. I loved it. Thanks, really.

[@drohungauge6694]

What I liked more about this video is that you don't just take some equations from a book. You made the calculus.

[@kanaiparui2840]

Thanks from India🇮🇳🇮🇳

[@classmepadhai2008]

I am also from India No one explain this in India You are genius 💕💕😘😘

[@sathishkumarpalani6364]

Hi Sir, It is a three axis helm holtz coil. in time 2:58. It will produce 3 dimensional magnetic region

[@PhysicsNinja]

Yes, you would need another set of coils for the z-axis.

[@ripleyastralabs5785]

@@PhysicsNinja there ARE a set of coils for the z-axis. You are showing a 3-axis helmholtz coil at 2:18

[@gforcebreakin]

Yes, Error in coil count at 2:15. Either say 3 HHCoil sets or 6 Individual coils. Not 4.

[@michak2193]

@@gforcebreakin I've also counted 3-axis (6 coils)

[@ghoul3387]

I was able to visualize it more clearly thx a lot

[@davidmusoke]

First time I've seen an analysis for a Helmholtz coil. Nice work ... what magnetics simulation software did you use for this presentation?

[@factzyt3098]

Thanks from Nepal🇳🇵🇳🇵

[@MrMegaL0N3]

Nice work. Thanks for the help.

[@Yando0]

Thanks.. The most efficient explination

[@haddow777]

So it's like sound or water waves and they are going in the same direction. Each wave adds to the other. So, if you pushed the magnets together, the point of highest strength would remain in the middle, but as the peak strength of each magnet got closer, the peak strength would rise until the magnets met and peak strength of double the magnet strength. Inversely, as the move apart, the point would stay the same but the total power would decrease. I assume that at the point when the point when the combined strength got close to or maybe as it moves lower than the peak strength of each individual magnet, the point of strength in the middle would divide into two points that would rapidly separate as each magnet moves further apart until neither magnet affects the other and the point of strength returned to the middle of each magnet. I don't know, just surmising based on what I saw

[@Greg_Chase]

We use Helmholtz coil pair for the uniform field it creates through a lamination (a series of layers) of 10Mhz aluminum foil/insulator layers The planform is: (1) a circular foil (2) a circular insulator (3) 10 layers of those The Helmholtz coils are one atop the other with a gap in between so that the B field is oriented vertically, and the 10 Mhz foil lamination (layers) are positioned in a horizontal plane between the pair of HH coils. We add another coil adjacent to, but not touching, the foil lamination and feed it with 10Mhz - this induces eddy currents in the foil (Faraday's law of induction) at a frequency of 10Mhz. People say "sounds like some kind of antenna" - partly true because the device creates accelerations of the charged particles in the foil, and antennas create accelerations of charged particles to develop/propagate electromagnetic waves, But in this case, the B field is vertical, the eddy currents are horizontal, and we have 90 degrees between the B and current flow, which causes the Lorentz force. The Lorentz force acts on the eddy currents in the foil lamination (layers) and creates coherent accelerations of the charged particle at a 10 Mhz rate. Why 10Mhz? Because that is the skin depth of store-bought aluminum foil. If you figure out why we are pursuing high frequency coherent accelerations in this manner, you are a rare individual indeed.

[@lucasmantovani3661]

Thank you for this video!!

[@ammarsayegh]

Well explained, thank you

[@marcusaurelius02]

Crystal clear

[@MrPokemonisawesome]

I wish My OU notes were this well explained

[@fsilveyra6469]

Amazing explanation

[@Kat-qh6ue]

Thanks for lesson. NIce artistic shelf ;)

[@skepticalmom2948]

I have actually build an electronics version of this at a physicists company I worked for.

[@PhysicsNinja]

That’s cool!

[@luxdraco1003]

@ 1:45 - isnt that example a 3 axis coil? ie 6 coils, offering an x,y and z direction?

[@PhysicsNinja]

Yes it is

[@AhlaAklah]

Could you guide me how to build up lap solenoid 2 tesla for doing an experiment I need it to rolling up a tube with 3 cm diameter and 15 cm length ?

[@alberttheengineer1412]

Hey, I have a question! I would Like to ask, how to calculate that total magnetic field, when the two coils have a ferrite core ... since the permeability is different, what would change in the equasion? Thanks! and great video!

[@dalenassar9152]

I didn't double check yet but at about timestamp 21:36 I got 0.75 (NOT 0.68) as the constant multiplier. I think your mistake was at about timestamp 20:36 THANKS FOR THE GREAT VIDEO!! --dALE

[@dalenassar9152]

I rechecked...sorry, I lost a 1/2. GREAT JOB! -dALE

[@Gary-ts6dh]

2:11 - I see six coils in the image displayed here (as well as 12 terminals which would make sense). Wouldn't that make it a 3 axis and not a 2?

[@bjarkismari]

What is the equation when the currents in the coils have the opposite orientation?

[@JuanhongHai]

What is Helmholtz Coil? Does it different from Coaxial Cables?

[@catman4471]

How would I substitute a flat coil for a helmholtz? I have a LF oscillator of between 1 to 30hz, amplified with the output going to a 14.3uh coil, 18 turns, 3.2cm diameter. How is inductance affected by a series or paralell helmholtz?

[@amark6876]

How the field is additive between the coils

[@JuanhongHai]

What is N represents? Does it represent the total number of turns from two coils or one of the coil? Could you please explain a bit? Thank you very much!

[@PhysicsNinja]

Number of turns for one coil

[@JuanhongHai]

@@PhysicsNinja So, Which one? Left one or the right one, what this depends on?

[@paulinamiller4022]

hey, i have a question what happens when distans between two coils is changed? for exaple if the distans was 2R insted of R?

[@sarasavio5789]

what is here B0 ? when I tried to plot the magnetic field the center is s dip (like two maxima and one minima) can somebody say something about this and also the common value of currents used

[@yogarajpriyanka6972]

Can you explain if both coils provide a magnetic field in different directions

[@jsholt123]

question: could the Helmholtz Coils be used to compress an field inside the center ... like putting an axial motor inside the Helmholtz Coils ?

[@jacobvandijk6525]

Could you do a video on the Golay Coil (used in MRI)? Or is that too complicated?

[@omehoque]

If you don't mind me asking, how to draw Helmholtz magnetic coils like that?

[@भारतीय-म6प]

मज़ा आ गया।

[@fall811]

why does the distance between the coil ends up as R?

[@PhysicsNinja]

This is a common setup for coils. It’s the case where the total fuel will be the greatest. You can set the distance to anything you want.

[@establishment1188]

The distance should be the same as the diameter of the coil, that will give you the most stable and uniform field.

[@DonPicasso_Jack]

you are the man!

[@Radcliffe17]

In the final equation, is N the total number of turns in both coils? Or just one?

[@PhysicsNinja]

just one

[@Radcliffe17]

@@PhysicsNinja thank you! I'm constructing a large set of three for my research, so I appreciate your video a lot!

[@PhysicsNinja]

@@Radcliffe17 happy to help. good luck with the research.

[@najiyafathima7776]

what is the value of dB/dx?

[@mohamedibrahim101]

Great

[@h7opolo]

you misspelled "strength" 3:09

[@paulfrischknecht3999]

The one on the right has 3 axis...

[@jaskiraatshah9445]

see we don't do such derivations in A levels!!! i have my exam tmr

[@itsjustanapple5452]

The only thing why I came here was that i wanted to know hoe to draw the homogenous magnetic field