[Youtube Review][Veritasium] How Special Relativity Makes Magnets Work

(Recommended)Popular Videos : [Veritasium] How Special Relativity Makes Magnets Work

 

This time, I will review the popular YouTube videos.

These days, even if it's good to watch on YouTube, sometimes people skip it or don't watch it if it's too long.

When you watch Youtube, do you scroll and read the comments first?

To save your busy time, why don't you check out the fun contents, summary, and empathy comments of popular YouTube videos first and watch YouTube?

(Recommended)Popular Videos : [Veritasium] How Special Relativity Makes Magnets Work

https://www.youtube.com/watch?v=1TKSfAkWWN0

 

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Playtime Comments : [Veritasium] How Special Relativity Makes Magnets Work

Is***:

Russians: *start closing in on Berlin
Hitler: 0:46

Ke***********:

2:30 How dare you push that cat over.

Sh*********:

1:43 "the cat is moving in the same DIRECTION as the electrons with the same VELOCITY".

Sa************:

0:52 that contracted car looks hilarious lmaaao

Sh**********:

1:36. But from the cats frame of reference, the electrons must be contracted and hence the electron density should increase. Why its also neutral here in the cat's resting frame of reference??

MO****************:

0:27 "they are PERCEIVED differently for observes moving relative to each other"
0:54 "ONLY in your frame of reference"
With these statements, TD and LC seems to be just perception/manifestation of human eyes (caused due to a limiting value of signal travel speed) but which isn't occuring in reality.

And again later, its brought up that cat expresses a repellent force due to excessive +q in the wire.
Now my doubt is, the excessive seeming +q in the wire (w.r.t the cat) is just a perception of cat's eyes/mind, (remember 0:54 "only in your frame of reference").
Also, it is an absolute fact that the current doesnt alter the +q & -q densities they are just drifting relatively.
So, is it true to speak "cat expresses force due to higher density of +q" ???

No******:

1:44


What if
Derek was hit by positively charged cat-ion

Pr*********:

Okay, I might be late, but my mouth opened at 2:03 and never shut back up; this finally answered some of my long-time painful questions about electromagnetism, while opening up many others.

I am in debt

al******:

0:53 HAHA

wh******:

So if you are confused at 1:33 - why the moving electrons do not have a higher density like they say with the protons are later on: The electrons move, so the electrons themselves get squished (let's just assume they have some width). Again: Only the electrons themselves get squished a tiny bit but this does not change the distance from one electron center to the next one.
Now later in the video we move along with the cat. This means basically that we have to move the whole wire(!) to the left constantly when we view this here in the video. The whole wire(!) - including the free space inbetween the electrons/protons. Now because the whole wire is moving the free space is squished, as well as the particles themselves.

 

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Top Comments : [Veritasium] How Special Relativity Makes Magnets Work

De*********:

Wife (While jogging): Honey, am I looking slim?
husband: Not even in my frame of reference?

Da*******:

This was amazing. Took a whole bunch of stuff I thought I knew and showed how it actually worked. Mind = Blown

t0****:

HEALP!!


am trapped in a loop between MinutePhysics and Veritasium >.<"

Ri************:

When Einstein was a kid, he was interested in a compass and the invisible force that made it work (magnetism). It is interesting to see that his Special Theory of Relativity is somehow related to that.

Az*********:

Arghh! You guys are just alternating me between these two channels repeatedly. I'll still do it for the love of science

Re***:

Why is the stationary cat not attracted to the wire? The electrons are moving, and thus slim down.?

Br******:

If the electrons are moving relative to a stationary observer, won't they be contracted, and thus have a higher density of negative ions compared to positive ions, and thus be negatively charged to the observer?

Fa***********:

question: from the observer frame of refference does the electrons also contracts? if so then the observer would be able to observe the special relativity effect on the kitty right?

ma*******:

But if you pass a current through any conductive object will it always become an electromagnet?

Mi**************:

This is absolutely friekin insane!!! I can’t believe my ears and eyes. Relative magnetism. Phenomenal!

Tr*************:

Our Prof linked this video as part of his lecture. So I have to ask: Is this part of the exam?

Hi***********:

Day 62 : I'm still going back and forth from Veritasium to Minute Physics.

Jo**************:

this is imho the best video of veritasium! :o

Ta******:

I feel the more I understand it the more confused I am. So how does the electromagnet attract a not moving metal object then?

Mi********:

when i saw the title of this video, i was like "GOD, YES!"
Awesome. First real explanation of (electro)magnetic fields i ever got. Thank you very much, have an awesome life! :)

Da********:

See the is why I love quantum physics and general relativity, its when you understand the physics is when your head starts to spin, not when you don't understand it ;)

Wi*****:

If the cat isn't moving, wouldn't the electrons be length-contracted, and therefore the cat should feel a negative charge?

Ma**********:

In ur frame of reference, the cat is at rest, positive charges are at rest, but the negative charges are moving, so they should obey LENGTH CONTRACTION, so density should increase, and therefore ATTRACT THE STATIONARY CAT!!.. 

so i call BULL! :P

We**********:

Need a cat for relativity since quantum mechanics has a cat. Then maybe they will get along.

ri************:

A positively charged cat is a cation.

ho*****:

On my fourth viewing of this video, I realized I was looking at... a cat-ion.

Jo*****:

Funny you should say that things "slim down" when moving. I definitely feel that runners are slimmer than the lazy people spending all day sitting.

Bl******:

Watches the video

Me: NaH NaH, this can’t be true, it’s too magic-y!

Al***:

This is the most amazing explanation I've ever seen about eletomagnetism.
Great!!!

Ta******:

The force is always there but the cushion each + has is harder to push. Like when you hit water at a fast speed.

St************:

Something I don't get: 1:26

Even when the cat isn't moving, the electrons are still moving. Doesn't this mean that the electron density in the wire would increase from the cat's frame of reference due to length contraction?

Pi*********:

even when the cat isn't moving, the electrons are moving relative to the cat. so shouldn't the same logic apply? why does the cat need to be moving?

Ju********:

I just want to say a BIG THANK YOU for your videos having captions in so many different languages. I started watching your videos and it was a struggle to try to understand English and Physics at the same time. When I saw that you have captions in my language I screamed of happiness! (This sounds weird but I have just realized the eager I have to learn Science) thank you, thank you! It's truly a beautiful thing that your channel is spreading knowledge to so many people all over the world. That's huge.

As**************:

i think he forgot to mention this
When the cat is stationary, in its frame
the only things moving are the electrons
(and not the space between them). So the electrons get squished but the distance between its centers is the same, and the charge density remains the same.
However when the cat is moving everything moves except the electrons, in the cat frame. So the protons and the space between them contracts, effectively changing the charge density and creating an electric force in the cat frame, or a magnetic force in the stationary frame

EDIT- this is my own explaination and I came up with it on my own and I was in 9th class when I came up with this answer one year ago now I am in 10th so I have only some knowledge about relativity and there are lot of new things to learn so maybe this explaination is wrong in that case please correct me. And this is my father's account if you are thinking why I look old

Vo****:

I got it! I finally got it! I was wondering, from the stationary point of view, why the electrons don't contract and attract the positive cat. It is because from the moving cat's point of view the entire world - the positive nuclei and the wire along with it - is moving. That is why the space between the positive charges contract. Because that space itself (i.e. the wire they're in) is moving in this frame of reference.

From the stationary point of view, however, only the electrons themselves are moving. This only means that the electrons are squished down a bit and get flatter, but the space between them (again, the conducting wire) is stationary. Therefore the distance between charges remains the same and there is no change in the charge density.

I feel so happy right now.

 

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[Veritasium] We gathered comments about popular videos and looked at them in summary, including play time, and order of popularity.

It's a good video or channel, but if you're sad because it's too long, please leave a YouTube channel or video link and I'll post it on this blog.

 

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