Plotting Magnetic Field Lines

A simple experiment demonstrating how iron filings may be used to plot field lines around:
A single magnet
Two magnets (repelling)
Two magnetic (attracting)
A current carrying wire
A current carrying solenoid (a long coil)
The basic technique is:
Cover the magnets with paper (or place paper in the area you will be scattering the filings)
Gently shake a few iron filings on to the paper.
Tap the paper gently to help the iron filings settle into a pattern.
The field line for the current carrying wire are very faint and difficult to see. This is because the field that is produced is very weak. If you look carefully, though, you may be able to make out some concentric circles going around the wire.

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[@svjuiy1240]

Yup

[@tacocatt6808]

This is so clear and makes so much sense! Wish more labs demonstrations felt this way lol. Very useful especially considering covid and online learning! Virtual labs just aren’t the same

[@061banyon]

Love your videos! No special effects and annoying jingles and stuff. Just pure experiment and the satisfying natural sounds they emit.

[@jnhrtmn]

The field "lines" don't exist until to put the iron powder there. Notice that the lines created by the iron change spacing when you tap on the page. The mass in the iron channels the magnetic field through itself and concentrates it, and this affects other iron mass in doing the same nearby. Each time you tap the page, they consolidate, and the spacing changes. So many people watch this and get programmed into thinking that the lines come first, but they don't.

[@soubhikghosh.8517]

Your Demonstration Makes Physics Very Intresting... Thank you so much for Developing Intrest.

[@durvapathak5891]

Sooo satisfying to watch, and helpful too!✌

[@rodun]

21:10 - looking at a diagram showing magnetic field lines of two dipoles inline, but spaced apart 21:11 - confused about why the lines are drawn a certain way 21:12 - wishing I paid more attention in class a couple years ago 21:13 - finding this video 21:14 - pure satisfaction finding out exactly what I wanted to know MANY THANK

[@v.wilde692]

This is so satisfying to watch

[@hizay713]

Lovely! Great job sir!😸

[@tacocatt6808]

Careful not to mix up “tiny metal powder” with “pepper shaker” 😆

[@anjumahmedhnasheedh833]

Lowey thought that was pepper was hoping to find this so Thank you

[@yeeterpotamus6537]

Lol they’re iron fillings

[@meisnirupam]

Physics lab vs kitchen lol

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you are so cool for making this video!

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Perfect illustration

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[@SanjanaRanasingha]

Yes

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Such experiments are really interesting !✌✌✌✌

[@similosihlegqalisisa8211]

thank you very much🙏🙏🙏

[@manishanirkumar4655]

Awesome! I actually think you’re making magic to make a magnet 🧲 field

[@Mr.chameleon]

He explained all my work in 3 minutes

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Very helpful video 🔥🔥🔥

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honestly made video . so many demonstrations very quickly . 👍😍❤♥

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So informative 🤩

[@thecalmer190]

Great one.

[@sanketbhujbal.6980]

Amazing 🔥

[@minevan7291]

Thinking about how the magnetic field is cool

[@gamechanger3739]

Really amazing Vedio sir 👍

[@jupiter84088]

So cool!

[@Redchopsticksgangmember]

First time seeing it virtually after learning from the book ☺️☺️☺️💗💓💗

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This is like an asmr science channel

[@d30z76]

Nice job, if i was your teacher ill give you 100%

[@Sujal_Thapa_]

really helpful!!

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Feels so good

[@JODFORCE]

I am very glad to this experiment

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Sir you are Great❤️❤️❤️.

[@user-kn6pk1hk3l]

Very helpful 😊

[@neeruprashar8762]

Amazing!!!!

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Thank you so much sir ❤💕❤

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Beautiful

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Awesome thank you!!!!

[@saritasingh9818]

Incredible

[@mprathik4885]

very well demonstrated... so far i understood that flux lines are an imaginary line. but this presentation tells that we have practical demonstration also available

[@thehunterwr4666]

theyre not imaginary lol

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Awesome sir

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We love Ur vids

[@postivemindformeditation5068]

Great sir ji

[@TheBigO1986]

Good video!

[@namitparekar1338]

was helpful thank u

[@edbunkers4516]

Could one stack 2 magnets staggered to reliably get an S shape from the powder?

[@mahit7]

Excellent

[@nothinginteresting1662]

Magnetic field lines may actually be circles. Consider a bar magnet. The two poles of the magnet can be considered as two points and the length of the bar magnet can be represented by a segment joining those two points. Now construct a perpendicular bisector of this segment. Then for every point in this perpendicular bisector, construct circles whose radii are equal to the distance of the given point from the endpoints of the segment. You will create multiple circles passing through both the endpoints. If you construct enough circles by hand or software (recommended), you will see a pattern start to emerge that looks very much like the pattern exhibited by the magnetic field lines of a bar magnet. Try it. While I cannot be sure that it is the exact pattern exhibited by the bar magnet, it looks a lot like it.

[@paradiselost9946]

why are there "field lines" at all? why not a homogenous "sheet" of filings? do they really show lines of force when they can be freely moved? and why, if one line of filings is moved, do adjacent lines tend to also move and maintain a certain distance? wouldnt one say that there is a force at right angles to the so called "line of force", spreading them apart? maybe the "line of force" is an illusion, a mistake on faradays part? also consider with the bar magnet... it is only a slice at some chord of the field. it isnt a slice through the center of the field like the solenoid shows. makes me wonder what "field" the solenoid produces if the sheet is placed alongside it as well rather than "through" it... something about the field of a bar magnet and the field of a solenoid is different...

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great job i like it

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Nicee yarrr😁😁

[@Redchopsticksgangmember]

Amazing

[@tecnica-de-voz]

meanwhile his wife looking for the pepper...

[@drecliscool378]

Its not pepper its iron

[@kaizerin1074]

Hahaha... can't differentiate btwn pepper n ironPowder

[@sridharbhamidimarri3374]

This was good but turning on the switches after placing the metal on paper will give more visual explanation.

[@QuantumBoffin]

A nice suggestion, but the current I was using doesn’t create a strong enough field to pull the filings into line. The magnetic field produced by a wire (or a loose coil, if it doesn’t have an iron core) is actually quite weak.

[@sridharbhamidimarri3374]

@@QuantumBoffin All the best for your future videos. I am waiting for them.

[@yahausingha8662]

Now I understand practically

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Great job I like itt

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Thanks alot Sir

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[@amanj.w.mohamed12]

thank u❤

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best video

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Cool❤❤

[@tomcarboni9234]

What kind of magnet did you use here - steel, ferrite, or alcino? Is one magnet type better than another to see the magnetic field?

[@SCP-FOUNDATIONSWAGSHUBHU]

Both should be equal to get the perfect result But u can also try magnets with higher or low magnetic strength 😊

[@joegonzalez6241]

0:30 this proves line theory. which is the correlation between 2 points. no the best example

[@SanjanaRanasingha]

Subscribed

[@Bilpung]

Heya, thanks!

[@TheRealLarissa]

Reminds me of a toy I had as a child where you used a magnetic pen to put iron shaving hair on a bald guy...

[@mahesh84]

in those days we used compass and magnet to plot magnetic fields...

[@davidselecandtech4732]

I had considered including that method in my video, but felt it didn’t quite fit. I may do a second video demonstrating the use of plotting compasses.

[@mas_ap]

Good So i subscribed u

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Dosta dobro.

[@abbasmerhi1]

what is that powder or metal u put on the papper ?

[@QuantumBoffin]

Iron filings

[@vijaybhaskarvaddadi8176]

Which powder has to use to magnetic line

[@QuantumBoffin]

Iron filings

[@upscaspirant4805]

Tq sir

[@nothingnothing4857]

Water in metal cools down when heat how can it take longer to cool ? Certain vegetables take so long to cool.

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Pls make vids frequently

[@akashelangovan6924]

@BOUNDLESS EXPERIMENT cool man!

[@Prince32774]

What you are throwing to the magnet

[@QuantumBoffin]

Iron filings: small ground up pieces of iron.

[@pianomello]

Those empty positions where irons are not arranged, does that mean that there is no magnetic field?

[@QuantumBoffin]

Great question! The magnetic field is actually continuous and is present (and just as strong) between the field lines. The reason new filings don’t fill the gaps between the lines is because they are attracted to the other iron filings (which have been magnetised).

[@purityvsprofanity2962]

who else kinda felt the ASMR effect while watching this?

[@nomadicculture6821]

Physics is my first love

[@johnnyjoestar9486]

Cool Sir!, But spin is better

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[@haleshhalesh6047]

By the way in physics our chapter is magnetism

[@fasihnaveed4676]

Bro this experiment is explaining magnetic field is discrete not continuous. But i want to know how the direction of magnetic field is determined. I mean magnetic field moves out of north pole and moves in to the south pole

[@QuantumBoffin]

In order to do that, you will need to use a plotting compass: place it on a field line and it will point in the direction of the field. I have another video that demonstrates this.

[@fasihnaveed4676]

@@QuantumBoffin yah i know about finding the magnetic field with compass . But how first time compass is created which gives the direction of magnet .

[@miguelayala3374]

Lol you could've put asmr on the description 🤣

[@lukiepoole9254]

Funny how NOBODY think that the ACTUAL shape of magnetic field is circular instead of "straight".

[@blackimp4987]

it would be more interesting spreading the powder and THEN turing on the magnetic field

[@QuantumBoffin]

You need a very strong magnet (or electromagnet) for that to work, as it takes a bit of force to make the iron filings move, and there is a tendency for them just to clump together.

[@firdousfatima7120]

@@QuantumBoffin yes absolutely also i have one question !! how does the iron filling form 'lines' and not clump together bcuz when we use a magnet the iron stuff around it gets attracted towards it and sticks to it and this lines are quite away from this ?! how is this possible like do we need an actual magnet for stuff to stick to it or magnetic fields can also make stuff stick to itself?

[@QuantumBoffin]

Nice question! Most people don’t think of asking this and most teachers don’t know the answer (possibly because it’s never occurred to them before). The reason for the lines is because when the first iron filing is sprinkled it becomes magnetised: one end becomes a North Pole and the other a south. Other iron filings will then stick to the ends of the first iron filing, and also becomes magnetised. This process repeats, causing the filings to form a chain: our field line.

[@firdousfatima7120]

@@QuantumBoffin thnx a ton sir!! do keep making such videos those help a lot!!

[@thekrzyszt]

These tests are showing that the diagrams and explanations used to teach the motion of magnetic waves maybe incorrect.

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I scream inside of myself when I see an expirement happenning!?

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Science miracles

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Op video

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Seeing your arms it feels like you are an aged professor

[@QuantumBoffin]

Older than I once was, but still young at heart 🙂 Seriously, though, when I reviewed the video I noticed how rough my hands looked: As much down to recent cold weather as it is age.

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Forbidden pepper

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