Iron filings are used to visualize the magnetic fields generated by coils. Ampere's circuital law is applied to a solenoid to determine the magnetic field intensity.
It can sadly also be a bad thing, by "all things" you can get some not so great nor helpful knowledge, I guess everything will always stay balanced and nothing ever will be completely "good".
I think of Michael Faraday doing his first experiments with iron filings and how it must have blown his mind to see these patterns jerk into position once current was applied. He must have felt like he had revealed something immensely profound, something truly magical.
i think of Faraday sitting there performing this experiment and saying Hmmm... No reaction, it didn't work hang on .. wait... shit i mixed up the iron filing jar with the pepper jar LOL then his mum is like Michael , stop playing with your copper wires and he's like............ Just 5 more minutes mum and she's like Michael....................now !!! LOL
@@zhibaniola6460 From what I understand... The movement of the fluid within the Earth's iron outer core creates electric currents which produce a magnetic field.
How is the magnetic field strength changed by the radius of the linear coil? I wonder if it diminishes in strength according to the inverse square of the radius. Should there not be another variable included? Eg. H = NI/(r^2)L
I was wondering why so many people never saw this demonstration. Then I realized that I never saw this in school, I only learned it from my grandparents on weekends.
I feel so fortunate to have been born in an era where people who are dedicated and passionate about knowledge can share what they know with the rest of the world.
What is really needed is a video that shows the difference between wire sizes and number of turns on coils that would actually be used in motors and generators. With and without ferrite or steel cores. Driven as motor and non-driven as generator. Loosely and closely coupled. That would be very useful information to builders. I have a diagram I would like to share with you. Coils coupled in such a way that most people would think they would cancel each other out. However they do not.
Thank you Mr. Michael for this experiment . This video helps me to better understand the magnetic field lines ☺️👍. Again thank you for the good explanation . 😊. It made our doubts clear and it is very interesting and fun to see this video 🙂
Great! These fundamental experiments are important because they lead us back and show - that's my feeling - that the theory or knowledge about it needs to be increased and improved even more
Wow!!! Amazing!!! If teachers might have taught me in this way, then my physics classes would have been more interesting. Also I wouldn't have ever tried to run away from my own subject.
This is a very good information for working with coils. I like the education with hands on and visual aids make this very easy to understand. Look forward to more great videos from you Sir. Peace
Thank you for this great experiment. I’m wondering what material could block a magnetic field like the coil you made @1:20 from interfering with anything close to it? Many thanks
This is excellent, how it should be done. Not only shows the practical demonstration, but how to do the practical demonstration for yourself. The opposite of mystification.
I have some questions. 1. What is exactly the interaction between the electric current that is flowing through the copper wire and the metal filings? My assumed answer is that the metal filings are being magnetized and so they are drawn to the copper wire, but I am not sure. 2. When a magnet is spun around a copper wire coil, is the wire producing electricity because the electrons from the wire are being stripped? Where exactly is the electrons coming from? The air? Or the copper wire itself? 3. As a magnet is spun inside a copper coil, is the coil then electrified? Then is that how we transfer the electricity to some kind of conductor that will then send that power to our homes? Want to know more about how the generators are functioned. 4. Last question for now, if electricity is simply electrons that are stripped from negatively charged atoms, then what is the nature of electrons? Is their nature just to flow and transfer that energy until it can settle somewhere? One more question, if magnets repel each other if we face the two like poles, could we not use that repulsion force to spin the generators in powerplants instead of using external power sources like coal, steam water and air? If we could use that repulsive energy that comes from a magnet, we could then have it recharge the magnets so that it can be strengthened so that the energy does not decay over time and use the excess energy to power our appliances is my assumption. Ok that is all I got for now.
Hi. I think I can answer some of these questions: 1. The current inside the coil generates magnetic field around it (Biot-Savart law) that makes those metal filings move around the coil. Looking deeper we can say that constant current affects the magnetic moments of elementary particles that "creates" the magnetic field around material. I think quantum physics provides better explanation of it. 2. Well, I can't say what's it caused by in material. In physics it's called "Faraday's law of induction", it says that electric current occurs when the magnetic flux changes in time. 3. It depends on the form of the coil and the magnet. Theoretically you can find a magnet that can be rotated inside a coil and won't cause any sufficient electric current. Again, if the magnetic flux through the coil changes in time then it'll "create" electric current inside the coil. 4. Not only electrons, electric current is the rate of flow of electric charge, it can be created by any charge carrier that changes in time. In metal it's electron, in semiconductor it's electron and "hole". The electrons in metal won't simply move as you wish, talking about electric current, the electrons compensate energy difference between two points (electric potential difference). If there are no energy differene then there are no electric current inside. You should create a potential difference between two points and it can't be made without non-electric forces. 5. You can but it's all about energy. If I'm correct then after some time of rotating something the magnet will become weak because of energy loss. You can read more in articles about remanent magnetisation. Correct me if you find a mistake.
@@b.e.nazarenko Wow I just realized something reading your reply I never noticed before. Do you realize that what said there in one juncture is that a magnet is sort of a capacitor that stores magnetic field just as a capacitor stores electric field. I used the word field instead of the word charge. Since charges create fields. Capacitors store energy in the form of voltage keeping opposite charges apart and storing electric field while in the coils with charge excitation, that are not separated create magnetic field in which when the excitation of charges stops, they use the term collapse, magnetic field collapses, becoming very intense and can cause serious danger crossing through whatever that capacitors can match as bad as they are. Magnets being very complex phenomenon store the magnetic field and unlike coils it takes a long time to lose it depending on the material. And it a permanent magnet magnetism field is not formed by means of charge moving but by means of charges aligning with their so called spin in the same direction.
Blue Ocean it all sound right except for magnetic field collapse. As I know, demagnetization of ferromagnetic is described by a hysteresis loop and there are no sharp jumps in it. But you are right about everything else. In coils happens the same as in capacitor, except that capacitor accumulates electric charges and coil accumulates magnetic field.
@@b.e.nazarenko To my understanding when you turn off power to any coil that magnetic field that is accumulated there collapses which I would think It means it can't keep its smooth curl loop by the excitation of the charges so it jumps through any gap and that is what makes transformers dangerous and diodes becomes necessary in circuit boards to protect instruments with every connect and disconnect, rerouting the charges. Capacitors are not used for this purpose as they would act as resonators if used that way with its own consequences. But they can not used to created an imbalance in the distribution of magnetic field as with induction motor to get it going and then turned off and is used as various means. It is interesting how everything has a personality even though those personalities and yet personalities change in different settings for a lack of a better way of saying it I guess. Didn't mean to get poetic on you. :-)
Blue Ocean it’s okay. :) The field, that is accumulated in the coil, changes smoothly. According to physical laws, magnetic flux (flux linkage if we talk about circuit theory) changes smoothly. When you turn off the current in a circuit with coil, the field inside the coil creates electric current. For better explanation I provided mathematical explanation of this process: Ф=IL (magnetic flux = current * inductance). e=-dФ/dt=-LdI/dt (Faraday’s induction law); I=e/R => I=-L/R dI/dt dI/I=-R/Ldt We talk about coil with already accumulated magnetic field which is going down because we turned off the power in circuit. So the current changes from I0 to I and time from zero to t (here I is the current at time t and I0 is the current at time when we turned off the power in circuit): ln(I) - ln(I0)=-t/(L/R) ln(I/I0)=-t(L/R) Applying exp function here we get: I=I0*exp(-t/(L/R)) Here we see that the current, at the time when we turned off the power (t=0), equals to I0. And with time it is going down smoothly like exp function does. In transformers problems are caused by Foucault’s currents. Problem comes when magnetic field creates volume eddy currents inside the transformer’s magnetic material. Eddy current transforms it’s energy into heat and the transformer’s material starts heating. If you remember how transformer looks like then you might notice that the center material is not solid but consists of laminations parallel plates. This reduces eddy currents to the volume of one plate. Talking about circuits I remember that diode at input is used for power polarity protection.
This is the method of teaching physics in America In India: Flux=B.A E=Bvl In exam this type of questions come so solve ncert/hcv. Let's solve board questions Let"s solve jee/neet numericals
Super duper educational. Pls, repurpose your material to a younger audience. Some great learning, even a parent could do with their kid(s), using an old transformer etc. Great content. Thank you.
There is actually no gap. There is a magnetic field in the space between the iron filings. The gap seen in the filings is a consequence of the finite number of iron filings. The iron filings appear to be on a line because there is an attraction between each iron filing and the one in front, and the one in back, of it like this, If you could zoom in and put a miniature compass between the iron filings, such as between the two lines above, it would rotate and be parallel to the adjacent iron filings.
Hey man I really think I got the answer, and I don't think it has to do with the number of iron filings. I was reading up on it from a few sources, the khan academy has a reasonable answer (I believe)... The answer is in the 4th sentence in the following paragraph, hope it helps and would love feedback from Mr. Melloch or anyone else, thanks. "Field lines can be visualized quite easily in the real world. This is commonly done with iron filings dropped on a surface near something magnetic. Each filing behaves like a tiny magnet with a north and south pole. The filings naturally separate from each other because similar poles repel each other. The result is a pattern that resembles field lines. While the general pattern will always be the same, the exact position and density of lines of filings depends on how the filings happened to fall, their size and magnetic properties" ALL in all what I interpret from this explanation is that the iron filings in a sense become like two magnets sitting side by side with their poles oriented the same so that they tend to repel one another... I would absolutely love to know just how many field lines a particular magnet or electromagnetic gives off, that would be sweet, like is the number in the hundreds, thousands, etc. for say a small 1 cubic inch magnet.
@@briansmith4853 so does it mean that if i use a smaller sized sand grains i could get more number of lines than lager grains since the repulsion would be lower in that case
@@joeljose182 Man that would be interesting to see the results of the surface area/ size of the filings .. The way I interprete magnetism, yeah.. Just think if you used iron dust or something like that small and compared it to much larger filings? That would give some clear results.. Good question man
Very good explanation, My teacher teached this today in the class but I didn't get it , I requested her also to explain it again but she just gone to next topic. But now I am feeling that it was good that my teacher didn't reexplain in the class because Sir you didn't even explain it but also gave a practical now my doubt is clear so, Thankyou so much sir
We were supposed to make an experiment of this at school, last year. I was responsible for bringing in some of the materials for the project. I came to school and a few hours later, our principal came into our class room and said "The first case of Covid-19 has been confirmed in our country, schools are closed until further notice." I felt a bit weird after seeing this video on my recommended.
Thank you, your video helps explain to me much more than i can expound on and in time, a few years from this comment, your spirit can be jovial in knowing even this video really mattered to quantum science.
essentially magents are warp drives in basic terms, now put a maget attach a magnet inside that coil and it will try to accellerate.. pulling the coil with it, and essentially this is warp so the magnet isnt really moving..
