Lenz's Law Demonstration - Penn Physics 

My dad worked at University of Penn for 43 years. He worked on the cyclotron machine, he called it the atom smasher. I won first place in the science fair in high school with electromagnetism demonstrated with a copper coil wrapped around a bolt and a little compass. Thanks for your video it brought back good memories.

i cant tell if this dude is young or old

the summary of this video are: -as the current increases, the magnetic force increases. -based on the experiment done, we can conclude that forces come in pairs, and energy is conserved (when mechanical energy transform to electrical energy) lastly electrical behavior is not intuitive like the mechanical behavior. Lenz's law states that the current induced in a circuit due to a change or a motion in a magnetic field is so directed as to oppose the change in flux. group: anis afzan nur syafiqah bt lukman nurul batrisyia

one word that i can say "amazing". i understand it well...

Very informative in a clear, easy listening voice. A big thanks.

2:56 simply wow. No one ever taught us that. Isn't this age of technology amazing that we can learn from any professor from the best universities in the world. We no more have to depend on our talentless teachers in our school who have no interest in teaching.❤👍

thank you! this was honestly very helpful ♥

Excellent presentation. Demonstration, explanation all at a level to induce interest and learning. Thank you

That is a professional explanation and well concluded and great elaborated

Thank you!! I spent a whole days trying to understand what lenzs is saying this is helpful

Wonderfully clear. Thank you!

I wonder what else we don’t know about magnetism and electricity. God is Awesome!

Very interesting. this video totally understand the fact of EMI Thank you sir 🙏🙏

Cool demonstrations... Really helpful

Honestly well explained, thank you.

Amazing explanation 👌, thank you very much sir..

¡Esto es lo que necesitaba sabeeeeeer! GRACIAS ❤

wow wow wow just wow, I regret that I just tried to learn physics from books. This was so intuitive and enlightening. Thank you

pretty clear demonstration! Thank you.

Excellent presentation, thank you ! Bill P.

Interesting and educational video. I got some pointers regarding my tiny home-project. It is similar, but also not similar at all. Science is fun, when using the Lego-principle. 'I have these bits, I want to build a car, but I might end up with a hovercraft'. -Goal accomplished, just inadvertedly way more fancy. I love taking the laws of Newton, Planck, Faraday, Wildeman, Lenz and certainly a couple of more, toss their laws around and use them like building Lego. If/When I fail, I'll have learnt much. -If I succeed... *Eyebrows will rise* I am just a simple man, how on earth, would I be able to make scientists swoon...

Thanks sir.Great job

Amazing explanation Sir!!!

Free energy folks has defeated Lenz's law with law of faith !

Amazing demonstration

Explaned very beautifully

Nicely done. This video should be required homework for all the RU-vid proponents of free energy devices involving motors and generators.

If red is north which is the convention, your flux lines around the ring at 0:50 are in the wrong direction if your intention is to show the flux lines generated by the induced current in the ring. See Walter Lewin 8.02X Lecture 16 Lenz's law segment 9 minutes into the video for the correct explanation and learn, University of Pennsylvania ...

IT IS VERY HELPFUL....THANKYOU!!!

Wow____so amazing technique to understand

Great jon sir.

Great demos, good animation, physics well explained Didn't pronounce it 'choob' 7/10, would watch again.

brilliant examples. thank you.

This is a very helpful video with a nice selection of demonstrations. This said, there seems to be a small error at 4:20. The blue arrows indicating an eddy current are both being illustrated as being in the same direction. The assertion of a number of other texts in this field shown these currents as running in opposing directions.

Best explanation ever .

It is a fact that power companies use the ability to change the phase relationship between voltage and current. Moving a magnet past a conductive loop induced a simultaneous voltage and current that reflect back the two components of electric power as the magnet moves. This puts the reaction in the conductor against the energy of movement in the magnet (the reflection is inverted.) changing the phase relationship of the magnet and loop would change the result, you don’t have to keep pounding your finger with a hammer after you hit it once. If the moving magnetic field and source charges of the magnet were inducing a charge in a capacitor, the opposite charge would attract the magnet’s charges first increasing the movement energy, then retard the movement as it moved away from the capacitor (a dance of first increasing the energy, then decreasing the energy; no absolute getting something with a direct cost (BTW, the energy generated depends on the rate of movement, so more energy is produced while approaching than is used to retard as it moves on.) then exchanges are not linear, amplification, getting something for nothing is the law of nature. Build a bifilar coil as Tesla patented it about 100 years ago and do the same experiment. The moving magnet will be accelerated through the loops, not retarded. Looks like a free lunch, but it’s using the capacitor to charge before the inductor (like it does in all LC circuits, and then force the inductor to do its thing as the magnet begins to discharge the cap as it moves away, creating a perfectly timed magnetic field that assists, not resists the moving magnet (nature produces both movement and electricity amplifying energy input to generate the electricity. It is a lie to say you must expend as much energy as you get to make electricity. Physics is not limited to unproven philosophical hypotheses, it is a science expressed by what can be done, even when the philosophical model fails to support reality.

Sir your teaching is ossom

WTH they do not teach like this in schools :\

Thanks to the Lenz effect, everyone can now easily and securely harness this negative force and add it to the total output possible from their system. Lens’s theory is the motoring effect in a generator and a generator effect in a motor. Lenz’s theory becomes a law when one is harnessing that negative output to add to the whole system. I suppose one has to own a bank to get something for nothing.

It is amazing!

Great explanation

impeccable

So professor , Do you think this type of new bicycles use this technology for resistance? for example: IC4 Indoor Cycle (brand: lifefitness) or SuperDuke Magnetic H945 (brand: bhfitness)

Thank you very much sir 🙏🙏😎😃

The magnets in the tube reach an equilibrium speed, similar to terminal velocity.

We want this type of physics not in the in the written form or in imagination or to rut but we want it practical to get more benefit of it because physics is love ❤

Wow last example is insane

U are great 🙏🙏🙏

We are so thankful.

nice job!

Beautiful

I’ve been watching lots of videos on Lenz’ law and this is among the best. I remember in grammar school there was a man who demonstrated hovering a pizza pan above (what I suppose was) a large electro magnet. I remember that he used gloves to remove it before it became too hot. Is there the same phenomenon with the magnet and the spinning disc?

I have a doubt sir is it possible to design such a body which can be used for elevated transportation through this lenz law application

Great man

and what if the north and south poles were placed horizontally along the tube? will there even be a flux through each ring slice of the tube?

THANKS A LOT

❤Thanks

Thanks. Greeting from Angola.

That was a well done demo. Thanks. If I may ask. How is Lenzs' Law and the Lorentz force related? Is there a link that can demonstrate this?

wah re wah pohran vip

Thanku very much sir

Vry nyc

@4:30 he states there are three forces, two magnetic forces and gravity. The only problem is, gravity is not a force, it is an effect. The electromagnetic forces experienced by the magnet in the tube are detectable, gravity is not. Gravity is still not understood. No one has yet to explain why two objects with the same surface dimensions with vastly different weights fall at the same velocity.

If i harvest cane sugar all day , do i collect more joules of energy than i used? It’s very easy to create blanket statment laws but even easier to break those laws with the same manipulative double speak !

Ever since Elon Musk announced his intention to catch SpaceX’s Superheavy Booster, I’ve been wondering if Lenz’s Law would be one of means used towards achieving that goal.

Thank you sir. 11.09.2022

Please tell me if I'm understanding this correctly. When a non-magnetic conductive object meets two opposing magnetic fields, a current is produced. That current turns the non-magnetic object magnetic. So in the case of mag-lev technology when the non-magnetic object picks up speed against a magnet the current becomes greater which makes the magnetic effect greater. This repels the magnet and creates the levitating effect. Is that correct?

What if I use a stick to force the magnet down the tube Do I get more energy? Also pls share your skincare regime

So what about the inventors who have figured out a way to defeat lenses law and produce generators that have no resistance but still generate power? Lenses law only applies under certain conditions change the conditions and you can defeat lenses law. Which means your statement that you don’t get something for nothing is incorrect ,defeat lenses law and you can Generate electricity with very little input force at first then once it gets going no force is required.

Thanks 🙏🙏🙏🙏🙏🙏🙏

What my objection to the last one was that ,suppose,when the magnet is kept touching to the circular rotating disk,and suppose ,for an instant of time 'dt',the magnet comes in contact with and area 'dA' of the disk .So ,according to me if it comes in contact with an area dA,a current should be induced in that area ,which is so obvious.and ,as soon as that particular are moves a little away from the magnet,the magnet field lines passing through that area ,which has and induced current, decreases, so ,then accordingly, the leaving area dA should exert an attractive force towards the magnet and an area dA1,which has just approached the magnet,and due to which the number of field lines passing through it increases,should exert a repulsive force;and both of these forces should cancel each other everytime,eventually not letting the magnet float or move away from its position.. Isnt that true?

Engaging charging turbines to front wheel drive may be redundant. I need to assemble a phrototype and see what happens going uphill downhill city and highway driving. I need this job.

Very nice

There are a couple of guys out there that Avoid the lenz effect Add an iron by the magnet and you destroy Mr Lenz

No current means no resistance. Voltage is present. The more current required the stronger the opposing force. That's why a generator bogs down under higher loads. We can design rings that produce more current with less heat and use thesetypes for next generation electric vehicles. Use larger copper current carrying conductors outside of turbines to lower resistance and prevent voltage drop. My vehicles will utilize flywheels and gearboxs at higher voltages to rotate turbines that will only be under load when heating or ac is needed or if the vehicle needs electric propulsion. The rest of the time the secondary battery will be charging. A depleted battery offers little resistance and accepts a charge with less force. More force will be required to top the battery off if you will.

Very interesting

why does the force point upward on the ring?

❤❤❤💖❤❤❤🧡❤💖

Hello and thank you for the video, it is very thorough yet simple and pleasant to follow and understand. :) I have a question about the 3 forces acting on the magnet falling down a tube: gravity and the two electromagnetic forces. If the two electromagnetic forces counteract each other, wouldn't gravity be the only force left acting on the magnet? Or did I get it wrong and the two electromagnetic forces counteract the force of gravity? Why do the two electromagnetic forces not cancel each other out? Sorry I am a new student to this. :) Thank you!

4:20 what would happen if we were in space and we pushed the magnet into the tube?

00:09 🧲 Opposite poles of magnets attract, and moving a conductor through a magnetic field induces an electric current. 00:38 ⚖️ Lenz's Law states that the induced magnetism in a conductor opposes the change in magnetism that produced it. 01:19 🔄 When an aluminum ring falls between the poles of a horseshoe magnet, the induced current in the ring creates a magnetic field that opposes the magnet's field, slowing down the ring's fall. 02:14 🧪 Lenz's Law serves as a critical test for scientific theory, allowing for accurate predictions. 02:53 ✂️ A ring with a cut (breaking the closed path for current) falls unimpeded through the magnet, showing no effects from Lenz's Law. 03:32 🗂️ Stacking rings to form a tube and dropping a magnet through it shows each ring's current opposing the magnet's fall. 04:42 🔄 Energy is conserved when converting from mechanical to electrical energy; you can't get "something for nothing." 05:20 🚄 Lenz's Law is applied in magnetic levitation (Maglev) technology. 06:27 🌀 A spinning aluminum disk can lift a magnet off its surface due to the induced magnetism. 07:07 ⚙️ Electrical behaviors, though less intuitive than mechanical ones, still follow the same fundamental laws of physics. Made with HARPA AI

badass dada

👍👍👍👍

What if instead of aluminium ring we use iron ring which is basically a ferromagnetic in nature

No words😇😌

THAT'S SERIOUS STUFF

Sir pls tell me in what form the electrical energy formed is converted

Just to ram home the idea that we do get more power than we personally inject, compare the ring test with the cut-out repeat; If you add the enegrgy you used to cut the ring, then see that the result got less power than the first test displayed, you see that more energy input can waste energy, if you do the wrong thing. If you get two guys jump from a height onto a giant bladder and a third person is catapulted into a lake from the other end of it, that person was just sitting there using no energy. The two just took a small step. They may have taken an e-bike up to the jump-off point. My point is the energy always comes from somewhere, but the individual does not have to provide much of it; this globe is packed with energy, and we just have to harness it. It's why men rode horses millennia ago.

👍

I wonder what overall effect on earth could be predicted by Lenz's Law that during the Sun's magnetic pole flips every 11 years (a solar cycle).

Makes you wonder why people still use diesel engines in trains to move about. The answer is rather simple: The energy needed to move such a heavy thing is above huge which would result in so many magnets it would be ridiculous. Not to mention potentional interference with electronics and other metal parts laying around the track along the way or two trains meeting each other on opposite tracks (remember what happens when you put two magnets together). There is a magnetic train in use but it is a closed circuit for city usage only and this concept most likely won't expand any time soon. The reason is mainly cost (building, maintenance and running) and the efficiency over a regular railroad is not that big so it would compensate for the higher costs.

The ring falling through the magnetic doesn't prove anything except that a magnetic field is induced. Same with the copper tube and magnets. How could an opposing/repelling magnetic field be induced by another magnetic field? It would literally cancel it out. It would prevent the field from being induced as soon as it was induced. If the magnetic fields were not the same, electricity generation would create a feedback loop, inducing current from rotor to stator, back to rotor forever, and melt the wires in the process. Also, why would it change direction just because the magnetic field is moving away or toward the inductor(?). It only makes sense that the induced magnetic field is in the same direction as the original magnetic field (attractive). Besides, if it was correct, transformers wouldn't work. They would not only be a load on the electrical circuits, the same feedback loop would happen, and transformers wires would literally melt from the induction feedback loop. What actually happens in a transformer is that the magnetic field reproduces the electric current in the secondary circuit. Similarly, you can increase magnetic flux by increasing turns ratio. The magnetic field is being reproduced in the iron core (a small initial magnetic field becomes much larger when repeatedly coiled around it). Magnetic flux is not ever used. Neither is electricity. They just flow through conductors. It's not like electricity is being dragged along by magnetic fields like a mechanical action. It's a perpendicular force (suggesting it's not directly related mechanically). So it's possible to get "something for nothing". I'm certain that your explanation is incorrect, and it has huge consequences.

What about solar panels

I like

is it me or do even people think that is okay it goes like whatever faraday said was correct because he thinks and assumes whatever he said was right and others just followed him what if someone else was there and they found a new law a new equation will it be the same or different there might be new equations new law many more so what do you think are we just following the words of the people told or are we just saying it correct because no one else knows the way to get a new law or new discovery

Awesome skin😎

You are right, but this is just up to now. Later we well remember how to apply geometry in order to create equilibrium and create self perpetuating loop.

This is what yt was made for.

Nice use of a PC slot blanker. 5.49