Lenz's Law Demonstration - Penn Physics

This series of demonstrations, made in collaboration with the University of Pennsylvania's Physics & Astronomy department, was designed for use in the classroom as well as review materials. There are silent and narrated options for each demonstration.

[jw]

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.

[buckybarnes]

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:
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nurul batrisyia

[shivanihr]

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.❤👍

[MegaSquiff]

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

[bigmikeh]

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

[rchandos]

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

[resyamieeman]

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

[SudhanshuRaj--]

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

[manekineko]

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.

[InvisibleshadowD]

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

[RocknRollkat]

Excellent presentation, thank you !
Bill P.

[Ulvetann]

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...

[zookeroni]

That is a professional explanation and well concluded and great elaborated

[Yusuf-dxhw]

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

[sundiesel]

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.

[RD]

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 ...

[Jaclose]

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.

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[ezeeusb]

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

[seansutherland]

Great demos, good animation, physics well explained

Didn't pronounce it 'choob'

7/10, would watch again.

[leexavier]

Amazing explanation 👌, thank you very much sir..