What is a Magnetic Dipole Moment ? (Electromagnetism, Physics)

Dipole Moments, maybe you’ve heard about this concept at school or at university? Maybe you even have used them when solving a question or problem related to electromagnetism? Yet, do you actually know what these things truly represent? Well, with this video, you will!
Magnetic dipole moments (MDMs) play a crucial role in various scientific domains:
_ Of course in Physics, you cannot get around these little beasts if you study electromagnetism.
_ In Chemistry MDMs are important in understanding the behavior and structure of atoms and molecules.
_ In Material Sciences, MDMs are obviously intimately related to the magnetic properties of materials.
_ The Medical sector rely strongly on MDMs for imaging detailed images of the body (MRI).
_ Planetology models the magnetic field of a planet by considering an MDM at the center of the planet.
_In electrical engineering, the concept of MDM is used when designing or analyzing circuits which involve electromagnetic fields.
So you see, understanding the notion of dipole moment is a must have for any student that is interested in science. In can be a little abstract, so the first part of the video introduces the viewer to something a little more familiar, electric dipole moments. Then, by mathematical analogy, magnetic dipole moments are presented and their true nature revealed.
When the video ends, stay a little… After the shooting, I took a few improvised rushes just for fun. For the first time, you will see me sharing a thought while in a state of complete improvisation. If you want more of these in future videos, let me know in the comment section of the video when it comes out.
Enjoy,
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Structure of the video:
00:00 Introduction
00:29 Content of the video
00:46 What is an Electric Dipole Moment?
02:17 The electric field generated by an electric dipole moment.
03:33 Effect of an external electric field on an electric dipole moment
04:45 What is a Magnetic Dipole Moment?
05:39 The magnetic field generated by a magnetic dipole moment
06:58 Effect of an external magnetic field on a magnetic dipole moment
07:59 Two solid definitions of a magnetic dipole moments
09:17 Magnetic Dipole Moments and the spin of an electron (improvised thoughts)
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Correction in the video:
The formula for Biot-Savart Law presented at 5minutes 45seconds, is not in phase with the graphical representation. According to the graphic the r vector in the numerator has a magnitude, but in the formula it should be considered like a unit vector. Thus, to allign graphical representation with the formula, the formula should have r^3 in the denominator instead of r^2.
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Prior knowledge required
In order to fully grasp the content of this video, the viewer needs to be familiar with the following concepts already presented in other PME videos.
_ What is a charge : • What is Electric Charg...
_ What is a field : • Electrostatic Physics,...
_ What is an electric field : • What is an Electric Fi...
It would also be useful to know:
_ What is a flux : • What is Flux? + an Int...
_ What is a magnetic field : • What is a Magnetic Fie...
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Credits :
The script, the illustrations, the music and the video were produced and presented by Edouard Reny, Ph.D. in solid state chemistry and private tutor in Physical Sciences.
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Need help with your high school physics ?:
Edouard provides one-on-one private tuition in Physics (face to face or by Skype). If you wish to know more about this, or contact Edouard, visit his website: www.physics-tutor.nl/ or this one (for French speakers : profdephysique.fr/.

Пікірлер: 39

  • @spencerwenzel7381
    @spencerwenzel73819 ай бұрын

    Excellent as always! Thanks for your work!

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    9 ай бұрын

    Wow, thank you so much Spencer! I really appreciate your superthanks, it encourages me grandly!

  • @Khaled_Elsadani
    @Khaled_Elsadani2 ай бұрын

    Really appreciating your valuable effort prof., Thanks a lot.

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    2 ай бұрын

    My pleasure Khaled, I am glad you appreciate my work!

  • @abu_staif
    @abu_staif29 күн бұрын

    I've been seeing your videos from time to time and they are the coolest physics videos I've ever seen in my life. However, some things like the live wallpaper or the sudden change in camera shots are pretty distracting for learning purposes. I really love what you're doing with all these effects and whatnot but I just wanted to point out the trade-off :) Perhaps some of the effects can be lowered/removed but not all of them?

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    13 күн бұрын

    Hello Abu, thank you very much for your remarks. I didn't think that these effects would actually distract the viewer. Could you point out some specific example so that I can visualize what you mean? And if any other viewer would like to join the discussion on that subject, that would be really helpful for future videos!

  • @johanneshakansson7562
    @johanneshakansson756218 сағат бұрын

    Thank you for those last two minutes, prof! On the quantum level, do you see the atom nucleus as belonging to the Higgs field and the electrons to electro“magnetic” field? Not many philosophers anymore.

  • @jibranhussain6067
    @jibranhussain60679 ай бұрын

    You are making difficult topics very easy to understand

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    9 ай бұрын

    Thanks so much for your kind feedback: It shows that I am reaching my goal to make Physics Easy (while remaining rigorous)

  • @jjthanetplanejames8317
    @jjthanetplanejames83179 ай бұрын

    after watching this, I now understand how a saturable reactor (electric component) works

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    9 ай бұрын

    I am very pleased to read that. Thank you for letting me know. The reason is that I am more of a fundamental physicist (by training), my engineering side limits to materials science and solid state chemistry. I have been in a "Maxwellian" phase these past few weeks, more by curiosity, and enjoyed learning about this topic as it shed further understanding light on physical phenomena I am familiar with. With no electrical engineer training, I had never heard about saturable reactor. The fact that the content of my channel helps others specialists in their own field, fills me with joy!

  • @kennyjohndelacruz3435
    @kennyjohndelacruz34359 ай бұрын

    this channel always amazed me

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    9 ай бұрын

    It's Physics that is amazing! Thank you Kenny for your kind words :-)

  • @hemalpatel9005
    @hemalpatel90055 ай бұрын

    Thank you

  • @MarwaMarwa-kw9uq
    @MarwaMarwa-kw9uq7 ай бұрын

    Your explanation is excellent When I visit America, I will visit you ❤❤

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    7 ай бұрын

    Thank you for your compliment Marwa. Well, you might have trouble finding me there since I live in France (I am French).

  • @sadiqhaq
    @sadiqhaq9 ай бұрын

    amazing😁😁😁😁😁😁

  • @sadiqhaq

    @sadiqhaq

    9 ай бұрын

    yes

  • @I_k_imon1518
    @I_k_imon15187 ай бұрын

    Love from Bangladesh❤sir.Sir,please give some basic video on Electromagnetism

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    7 ай бұрын

    there are quite a few on this channel Check: what is potential, what is a field, what is an EM wave, Gauss Law, what is a magnetic field etc...

  • @dalenassar9152
    @dalenassar91525 ай бұрын

    I just now found your channel...can't wait to see the other videos. And extra thanks for the last part and the concept of "electrons spinning on themselves" !!! One question: At about timestamp 5:45 when you show the Biot-Savart equation, should not that be a UNIT vector, r, in the numerator?? If it is as shown, wouldn't the denominator contain r-magnitude cubed ? Since r-vector = r-unit-vector times r-magnitude. I ask since it would be GREAT help with what I am working on now using Biot-Savart. THUMBS UP ans a SUBSCRIBE!!

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    5 ай бұрын

    Absolutely correct Dalen. That part of my video can be confusing, because according to the graphic, the vector r in the numerator has a magnitude. Thus, the denominator should be r^3. Ooops, mistake... Unfortunately I can't change it in the video, but will add a little note about that in the description. Well spotted!

  • @profelu1919
    @profelu19196 ай бұрын

    Viewing this while listening to Equinoxe is awesome

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    6 ай бұрын

    haha Equinoxe is cool (I suppose you are referring to JMJ), but my videos can be quite dense... that's why I do not put music in the background ;-). In the end, this decision is a good thing then, because the viewers can choose their own audio background to make the most of the lesson ! thanks for your feedback

  • @thomasgeorget
    @thomasgeorget9 ай бұрын

    How magnetic dipoles occur in permanent magnet materials? Is it because of spin ? If yes how spin can create current?

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    9 ай бұрын

    I plan this question to be answered in the next video (I still have to write a plan / script for that ). We say an electron has spin because we detect a magnetic dipole moment (MDM). If you see, an electron like a little ball containing charge distributed evenly in the volume of that ball, to get this MDM, you need the ball to spin (that will give you concentric loops of current). Of course this is a classical physics view, which at this scale, is a very very rough approximation of reality. Permanent magnets contain usually electrons that are not paired, (In a pair, the MDMs of the paired electrons cancel each other). Each unpaired electron in the magnet will therefore contribute to the full MDM of the magnet. That's why when you cut a magnet down to its most elementary particles (Electrons), you always have a north and south pole, that is, the N and S of the electron's MDM.

  • @andrewjustin256

    @andrewjustin256

    7 ай бұрын

    Let me get this straight. Since we detect magnetic dipole moment to electrons, we assume there must be a spin (perhaps from Stern-Gerlach experiment); after all, magnetic dipole exists and electron revolution is a current. However, because electrons aren't teensy-weensy balls rampaging the nucleus, this notion becomes fuzzy and electromagnetism teacher or professor says "Well, having a permanent magnet is purely quantum mechanics, which is beyond the scope of this lecture. For now, just embrace the fact." Right, Mr. Edouard?

  • @jnhy110
    @jnhy1107 ай бұрын

    Love from India ❤😅

  • @cutegirlRiya5102

    @cutegirlRiya5102

    3 ай бұрын

    From me too thanks sir ❤ From INDIA 🍀🌝😌

  • @thyagarajansukumaran6609
    @thyagarajansukumaran66093 ай бұрын

    Sir ur amazing But make it little interseting or fun while explanaing so that we students will understand is more easily or convinentily

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    3 ай бұрын

    Hi, I am trying :-)

  • @andersemanuel
    @andersemanuel9 ай бұрын

    I think the analogy fails because of Faraday's paradox. I believe you should see loops of wire as lenses. Concentrating the ever present magnetic fields around us. Not creating them. Then it makes sense that the field is fixed in a coil, even if you rotate it along its axis. It also explains gravity of giant objects and why superconductors block magnetism.

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    9 ай бұрын

    Hi emanuel, thank you for your comment. What you are suggesting with this interesting idea of seeing loops of currents as magnetic lenses makes me think about gravitational lenses, here you would change the "curvature" of a magnetic field, like a G lense curves space time. I think that if such a unified theory had been validated, we would know about it (If I remember well, Einstein worked on attempting to unify EM and G for most of the end of its life without success). I am not an electrical engineer, just someone that enjoys stepping out of his comfort zone by learning a little out of his field (and sharing what he learns), so take my opinion on Faraday's paradox with a grain of salt: imho, the paradox comes essentially from neglecting the voltage measurement system connected to the rotating disc. I found a recent paper that carried out experimental work on this and discusses it. It leans towards that conclusion. Check it out here: sciencex.com/news/2022-10-faraday-paradox-experimental-evidence-circuit.html Please note that I have no data about the reliability of this work, so if what is written in that paper intrigues you, you should look for more info about the authors.

  • @andersemanuel

    @andersemanuel

    9 ай бұрын

    @PhysicsMadeEasy Thank you :) Not even Einstein could explain the paradox. As late as 1987 Keene made use of this paradox though. As the field lines seem to be stationary in a rotating coil it is more likely that they are just compressed already magnetic lines existing all around us. The Keene patent made "gyros" so much cheaper and enabled inertial navigation down to microlevel ships. kzread.info/dash/bejne/lWmryc-Nd8yboLg.html I know as my profession used to be a captain on intercontinental airtravel. Laser gyros were really large and expensive. I Made a DC homopolar motor that makes use of this principle. kzread.info/dash/bejne/i66Kp8eAZNDaadY.html The next step now is to make a generator that is more practical. The amazing thing is that the motor seems to produce no feedback torque, as it is pushing against the field lines that are stationary and independent of the magnet/coil!? So it might be used for steering satellites in space without the need for ejecting matter, just grabbing hold of the ever-present field lines in space and swinging it around :)

  • @user-py5ms3xd9j
    @user-py5ms3xd9j9 күн бұрын

    Sir I am jee aspirant from india . I want to know how I can deal with physics.

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    Күн бұрын

    If I remember well, jee in physics is a demanding program. If you are having trouble with following physics class, I recommend you try a different approach: Pick up a good textbook (Cambridge Tsokos, physics for the IB ,for example). Learn notions inside it independently from class, and then when you have a goo grasp of the basics, try to apply what you have learned to the exercises your teacher has worked on in class. Sometimes, taking another angle, biased by a different culture, then coming back to the original can help!

  • @user-py5ms3xd9j

    @user-py5ms3xd9j

    23 сағат бұрын

    Thanks professor This will help me a lot to get core understanding of physics but I am confused that when I read compulsory theory but I don't feel like that I read theory but to do many miscellaneous problems from practice point of view thenHow can I troubleshoot this issue .??

  • @PhysicsMadeEasy

    @PhysicsMadeEasy

    23 сағат бұрын

    @@user-py5ms3xd9j Well, take a jee past paper and try to answer questions on subjects you already reviewed in class. Check those you did not get correct, and for which you do not understand perfectly the answer. These are the topics you should focus on by studying other sources that deal with these subjects. It allows you to approach the problem via another angle... and offers you another opportunity of understanding the concept. Then, you go back to your class teacher's approach and try to make sense of it based on what you learned 🙂

  • @user-py5ms3xd9j

    @user-py5ms3xd9j

    23 сағат бұрын

    Thanks sir But I have a doubt that Like rotational mechanics gives tremendous fill but Its questions are too dangerous but Fluid mechanics is very boring not much interesting but indeed in jee syllabus I have to learn and also its questions are quite troubling means we dont know what we have to do in particular problem so How I can i clear this riddle ??