The Case of the Charged Comb (ElectroBOOM101-002-01)

This video answers a few questions to a good post asked on ElectroBOOM subreddit: / electroboom
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By: Mehdi Sadaghdar

[@EliasKaydanius]

"The answer to all these questions - YES" -Where's the voltage? -YES.

[@yasyasmarangoz3577]

xD

[@jakobi2800]

Yes

[@overthetip]

Where's the H?

[@mynameusedtobelong]

So was here that this meme strated

[@superpokemonbros.9441]

​@@overthetipYes

[@supersmashbrosevil]

The ruler can get much more charge by rubbing it against the unibrow

[@kwyj]

Too much powah!

[@__cm__]

supersmashbrosevil HAHA

[@ahmadmalik3757]

But you will need a Fooooolll bridge rectifiaaaa

[@bald_chicken]

No because that’ would be "over-unity"

[@NerdyCatCoffeeee]

H's gonna shock himself.

[@rogerdodger5886]

Honestly one of my biggest goals in life is to obtain your level of knowledge in all things related to electromagnetism

[@lenkamontskova7483]

Impossible

[@ElectroBOOM]

Hey all! You can also post your questions to ElectroBOOM subreddit: www.reddit.com/r/electroboom

[@mrtakaroyt7721]

ElectroBOOM maybe you pick up some voltage or something just like that magic bucket and just by rubbing your ruler on your hair lol.

[@xrehpicx]

ElectroBOOM ooooo love your videos

[@gianpauldulfovideos4149]

Hi ElectroBOOM I’m your subscriber from Philippines

[@arshalanmohammed2802]

Sir u don't have to rub that ruler on ur head while saying "rub it to ANIMAL FUR".. It's insulting for a good teacher I've known ...

[@akashmukherjee2405]

Mehdi, you could be a great teacher at MIT for your wonderful skill of explanation..... Many a small number of men has this talent..... I liked your video by the way.... Awesome job.... Keep it up....

[@HomemadeChemistry]

"Animal Fur" kills me every time!

[@curious_elephant]

Homemade Chemistry the videos been out for 15 minutes how many times have you watched that one part

[@HomemadeChemistry]

He referred to his hair as animal fur before

[@eloniusz]

Why he reach for his head when he has so much animal fur on his arms?

[@ppsarrakis]

even the noise he makes is the same my dog does when he scratches his ear.

[@2nickso]

You should have rubbed it on your “Uni”

[@dipanjanbiswas1105]

**It was an amazing video**. This questions just blew my mind. I never saw static electricity from these points of view. Amazing explanation as well from you. Please make sure to post this kind of quick videos on this channel in the future. I really appreciate them. Thank you!

[@NFSSAM]

Actually I do share your sense of joy, this was an awesome video!

[@RetroGamePlayers]

ElectroCOMB

[@ActuallySmartEarning]

Retro Game Players ,nice

[@AbiJaay]

I read this as COOMB

[@expiredlamb2000]

🤣😂😅😐🤔

[@RainBoxRed]

ElectroCOULOMB

[@frankwang9593]

Yeah, electric comb

[@TheArjegos]

Noooo!! Make it public. You'll never know what is like receiving the notification from your channel and drop all the stuff you were doing! I demand more videos, or may your eyebrows find their boom! Keep the great work :D

[@MamoonSyed]

We need to get this man a ruler that isn't about to break.

[@rikrishshrestha5421]

rather give him a "animal fur " on top his head

[@cesaryoshikawa7656]

Ooohh! Now I understand why you are losing hair!

[@yboy898]

I'm a year too late but still... *OOF*

[@okboomer_in_roblox4760]

LOL

[@Aetohatir]

He doesn't lose hair, he loses animal fur.

[@Mango-yc7tw]

Pretty toxic ngl 😂😂😂😂

[@railfanjames7699]

lol

[@ianhill20101]

Ive watched so many of these vids im starting to get a unibrow.

[@TheLicherKing]

Ian Hill Same.

[@ianhill20101]

Arthas Menethil Our brains require additional thermal management

[@technus102]

to much potential difference between them they need to connect into a unibrow

[@ianhill20101]

I've got electrons building up on my nose hair it's only a matter of time until I'm a yeti.

[@ThePrimevalVoid]

10/10 - I expected this to be a huge, "Why your wack theories are wrong" video. Turns out physics is a lot crazier than I thought.

[@mohammadjuned8524]

This is the proper way of teaching a concept. Please start teaching people how to teach.. The best video I have ever watched on KZbin. Can't describe how much I am overwhelmed by your methods. Keep Prospering.

[@shubhamchandra4138]

Hey Mehdi, I have been a fan of your channel for quite some time now. Bravo for taking this effort to make a video answering such an interesting query, one that I can say for sure most teachers and profs would ridicule easily. Great work buddy and keep videos like this coming. "Of course if I shake it, it makes it" - Mehdi Sadaghdar, 2018

[@OneAshMan]

I like when you have the clock in the background of your videos. I like to watch it skip ahead during your cut scenes.

[@ddsenpai7588]

Lol i almost died at 0:35

[@maxisntcool4241]

His head tho

[@acim0095]

You mean 0:36

[@antonpiliugin811]

This is how physics classes should look like! Awesome explanation on so simple but very important questions!

[@purvel]

2:51 It IS awesome, and it made me joyous too! It's cool to see you so curious and happy instead of furious and snappy ;)

[@traditionaltools5080]

Great video as always. If only instructors could present information in such captivating and interesting ways. Listening to a 3 hour lecture is mind numbing.

[@MyGold2011]

0:30 the observer moves 😂👌🏼

[@fatmn]

Make the follow-ups public! This was really fascinating! You answered a lot of questions I didn't even think of!

[@foxarashi6397]

keep it up, Mehdi. also i laugh every time you move your head like that when saying 'the observer moves'

[@GermanBeez]

Thank you for leaving that note on Andy's (photonicinductions) explanation video. It means a lot to us and i'm sure it means a whole lot to him. you're a really nice guy!

[@superj1e2z6]

They didn't teach that charged ruler stuff in my electromagnetics class.

[@mayurbalwani7277]

superj1e2z6 It's a very good question. In a way, it is related to the relativity of Einstein.

[@ArchangelAurora]

could you explain how is it related to relativity? I couldnt quite get it. Why would there be voltage current or anything when just the observer moves?

[@zachell1991]

it's only because the observer is within the range of the magnetic field, if further it would not effect it.

[@DatBlueHusky]

you dont learn everything in school. The most smartest and successful ppl in the world have dropped out of high school

[@erkzneedtu]

well it depends upon "moving" in respect to what.

[@albinonemo]

I love this series. Simple yet insightful. Could you make a video explaining the concept of imaginary numbers?

[@andrasfogarasi5014]

1:48 "If I bring my hand close it's not picking up any voltage." *picks up -0.01V*

[@Owen_loves_Butters]

0.01mV is almost always just noise.

[@youssefali6014]

your channel like a hidden treasure i didnt know about it except from two weeks ago it is amazing

[@AlexProw]

Novecientos tres te beeest

[@EMW_Music]

I also enjoy mentos

[@airpeguiV2]

Lool

[@SergioAnubarak]

why in spanish? XD

[@wachocs16]

It took me a while to realize it was in Spanish. I'm Argentinian :v

[@airpeguiV2]

Santiago Ré español robótico :$

[@mavos1211]

You are such a clever man, I love your videos and I learn so much from watching them. Thank you.

[@bobbyrp9881]

You should make a separate channel for fully educational videos like this. Because you're a great teacher too..

[@Robert_McGarry_Poems]

I share your sense of joy, I love the giddiness in your voice when it works. I am there with you.

[@nabeelmajeed7462]

Don't make em private .. uploaded then on KZbin .. or something please

[@Nemersis]

Agree. Post thread answer vids too.

[@nchutchind]

I may not get out much, but seeing the voltage show up on the multimeter when you moved the ruler is one of the coolest things I've ever seen.

[@akashmukherjee2405]

Mehdi Sadaghdar 0:20 broke his own ruler to explain the situation.... Lol😂😂😂 .... Great explanation by the way.....

[@leocurious9919]

No, it was broken already. You can see that crack befor he throws it off.

[@Seyanhyriu]

1:03 - That head movement cracks me up! LMAO

[@pesterenan]

NOVICIENTOSTRÊSDEBEEEESTE *HAHAHAHAHA*

[@U014B]

*JAJAJAJAJA

[@borgesguerardi]

*puts out some classical guitar*

[@christianbro2]

novecientos*

[@SreenikethanI]

@@borgesguerardi you mean pulls out some Electric Guitar

[@sanjaymurthy1719]

This is your best video ever. Refreshed my basics from 30 years ago !!!

[@mike.correa]

Noooooo please publish the ElectroBOOM101 here too1!!

[@VGhev]

I became an instant fan of this video series! Thanks a lot ElectroBOOM! Please keep alive this awesome serie!

[@gofar4]

The ruler have less electric charges because you have less hair in your head.. That's my theory..

[@theterribleanimator1793]

Ade Rama but its compensated by the unibrow, so DEBUNKED.

[@saurabh4381]

S S more likely destroy it!!

[@vedvery5]

AdeRama Hair rule

[@MathewZ788]

True AF

[@MathewZ788]

@S S got em'

[@uziTGC]

it took me a while, but now I KNOW you are my favourite KZbinr

[@TechsScience]

I like first then watch

[@TheAaron2442]

Tech's Science me too! Always for my favorite creators.

[@jonavanderpal]

I take a shit sometimes.

[@Tomijones]

b1g flex

[@AlaaZorkane]

Hands down, the best channel in youtube

[@BDY37GG]

Hi ElectroBoom.

[@TTime1312]

So I actually did pause at 5:35 to think about it and, as a lay-woman, this is my assumption; I do not think there would be a magnetic field created because the electrons are not traveling through a stationary medium, or vessel. I assume the energy would be, mostly or exclusively, dissipated in the form of friction and heat as it traveled through the air once you threw it.

[@TTime1312]

Well 2 seconds later the video I was wrong .

[@Cheese_1337]

Hello Mehdi!

[@TheDejfson]

This is the best ever demonstration of magnetic fields I have ever seen.

[@MlTGLIED]

I read *"the case of the charged Bomb"* O_o

[@ep82chris]

Mind blown 🤯 thanks for the unbelievable amount of info on this channel

[@Cheese_1337]

3:15 That ear flap 😂😂

[@Iffrat]

IMO I would love to see videos like this on your main page. I enjoy the way you deliver this information and even knowing I didn’t learn anything I still found it entertaining and enjoyed it. I vote you don’t make them private and you include them as additional main channel content.

[@multiplier6613]

Learning electricity with 68 others

[@rahulkr1515]

I m getting into college and i knew the answers to all those questions but still your way of explaining was awesome. waiting for your next upload.

[@UNZO_OFFICIAL]

can't see the TV again! Must be my roomates moving a charged ruler!

[@ArkhamKratos]

Your one of my Favorite KZbin Channel. when i get Upset or Depressed i watch your Videos to cheer me up and do a Great Job on your channel Bro!!!

[@63banshe]

no "give away tiiiiiimmeeee"???? :( I want your Ruler!!

[@debarghyamukherjee9157]

banshe 😂😂😂

[@admiralpercy]

This might be your best video yet.

[@windsunh2o]

4:05 "deMONSTERate" =)

[@maxwellcatlol]

Ur bad fckimg sh!T man

[@J-Eagan]

I really liked this video, oddly enough I hadn’t really thought about the questions before despite being in a physics E&M class. Really makes the entire subject seem more down to earth. I mean you can do all that with just a charged comb! Anyway please keep the videos public or put them on your second channel or post links to the videos from your second channel using the KZbin announcement thingy. Really don’t want to miss any of these!

[@J-Eagan]

Oh and just a fun follow up, since you can make electromagnetic waves using a charged ruler, does that mean you could possibly produce visible light with just a charged ruler? I’m guessing you might have to move it at crazy speeds, but it would be a funny calculation to find out what you’d need to do with the ruler.

[@CrucialMuzic]

Informative as always :) To whom ever is reading this, have a great weekend

[@mikem8828]

Quick 5 minute video took over 2hrs to record, thanks for all your effort!! Watch the world Learn.

[@shreyverma2971]

0:22 every jee advanced question ever... if you know what i mean( india's third most difficult examination)...

[@tiikoni8742]

2:50 I totally share your sense of joy, that was great simple experiment :-)

[@battutulu3030]

Handsome eyebrow ever lived...

[@juanoncho]

2:50 yes.. i shared your joy, i was amazed.

[@nietschecrossout550]

It's induction, baby! @ElectroBOOM 0:30 Current doesn't flow when there is a voltage diffrence, but when there is a difference in electric potential; a voltage. V = phi_1 - phi_0 At least this I what I've been taught

[@6alecapristrudel]

You can define either phi to be 0 Volts (phi_0 - phi_0 = 0 V, since it can't be different from itself); and since units are important and you cant just subtract different units and get a sensible answer then the other phi must also have units of Volts. There you go - a voltage difference. If I connect the negative terminals of a 1,5V battery (V_1 = phi_1 - phi_0) and a 9V one (V_2 = phi_2 - phi_0) I'll get a voltage difference between their positive terminals even by the proper definition you gave. You can probably guess what happens if I also connect the positive terminals together... The absolute electrical potential energy of a charge (phi) cannot be measured anyway. Theoreticians just love their abstractions.

[@PersonaRandomNumbers]

Electric potential is voltage. A difference in electric potential is a voltage difference. It's just terminology. It should be noted that the comb moving isn't due to a voltage difference, though. It's due to throwing the comb :P

[@slashingraven]

It was fun watching the clock hands jump around over the course of the video. Almost the entirety of this video was filmed within a 2-hour span of time.

[@Vk-gv3sc]

Never get bored of eyebrow dance+beat boxing

[@rakbar6509]

Hello... I'm from Indonesia... I like your videos... Very educational... 😁 Sorry for my bad english...

[@MitchellShilling]

#FullBridgeRectifier

[@Foodhat]

MitchellTheFurryFan2001 Bull Fridge Rectum Fryer

[@rogueanuerz]

full bridge plutonium fusion rext

[@ag135i]

The way you nodded your head while saying observer was awesome and funny.

[@wesraevens3122]

Why was mehedi taken to prison? . . . . . He was charged with battery 😂

[@satan2583]

*he*

[@michaellin7936]

Wes Raevens *sigh*

[@muddassirahmed3342]

U and ur lame joke

[@sa_ad]

With a supercap

[@BlokeOzzie]

This is a great channel. I have learned so much about electricity and booms.

[@dexterprod5553]

Where did you come from

[@xmvziron]

Iran

[@anitmatic]

I love that Mehdi shows his work, even when the results aren't the ones he's trying to demonstrate. He could easily have said, "magnetic field, yup" and I'd have believed it, but he goes out of his way to demonstrate what's really going on.

[@air10saino]

o hi mark

[@apathetk]

The Questions 3 and 5 demonstration was really cool.

[@ninadpchaudhari]

Instead of a link on website. How about another channel !!

[@arshalanmohammed2802]

Great video sir Really enjoyed thinking and subsequently understanding , great questions were asked

[@syedarslanalishah6905]

Why teachers don't teach us like this?

[@KH-vq6fs]

Arslan Shah either they aren't paid well (USA) and/or the education system is too one dimensional (sub-continent).

[@arshalanmohammed2802]

Arslan Shah because most teacher teach without any concern of students . That is, they know they will get paid even if students doesn't understand the concept. (Most of the teachers themselves hadn't got their concepts accurate )

[@MrCordycep]

They probably don't want to burn their fingers on hot wires or something. 🤔

[@arshalanmohammed2802]

He doesn't have to rub that ruler on his head while saying "rub it to ANIMAL FUR".. It's insulting for a good teacher I've known ...

[@syedarslanalishah6905]

They can't move their eyebrows like Mehdi. Simple as that.

[@n0bleteamleader239]

make them public i love learning from you you dont dumb it down too much but make it graspable for the simple minded

[@billxrl4154]

I misread the title as: "the Case of the Charged Bomb"

[@alfredneumann4692]

This test with the glasstable is awesome! Thank you from Germany.

[@jandd661]

Help ElectroBOOM! My daughter asked me how the toaster knows when the toast is doen. I told her it was Voodoo but she say through my lie. I told her I would find out and emidiatly came here. So how does a toaster know when the toast is doen? Thanks!

[@Antique1dude]

It doesn’t, a toaster has timer that whenever you adjust the temperature control it adds or subtracts the running time of the toaster. I happen to have a 60 plus year old toaster that is basically the same concept of a modern toaster but it has only a mechanical timer. It actually makes better toast than any modern toaster that I’ve used, because on a modern toaster it’s either not even light brown or it burnt.

[@tpespos]

1stGenGamer I don’t know about modern day toasters but old ones used to be controlled by a stick of metal that had two different types of metal on it. Each flat on both sides like a sandwich ... ish bad analogy but as the inside of the toaster raised in eat one of the two metals expanded faster than the other causing the stick to bend one way and once it bent enough it would cause the toaster to pop the toast that’s also why old toasters needed a few seconds to cool down not long really and the nob you spun controlled the length of the metal rod because it was rapped around it changing how much it needed to bend to pop the toast

[@MrTeddy12397]

It's just a timer you idiot

[@theenzoferrari458]

Lmao. XD

[@mattquick5045]

@@MrTeddy12397That's a bit harsh.

[@epicwhaleburger]

dear god im taking electricity and magnetism next semester pls keep pumping these out they're awesome

[@4UDIOTAPE]

I read it as "The case of the charged bomb" ... Dunno why

[@LaughingOrange]

Me too, the BOOM in his name probably didn't help.

[@kirankumar-ki3ci]

Damn me too I came to know it's comb after reading your comment but I haven't watched video tho... But still my brain trapped

[@4UDIOTAPE]

haha nice!

[@4UDIOTAPE]

Damn right xD

[@prod_xen]

I read it as bomb too

[@sorenium]

This is way more cooler than it seems....Because I didn't think of it earlier 😊😊

[@mahdie6762]

سلام امیدوارم فارسی رو هنوز فراموش نکرده باشی😁 ویدیو هات فوق العاده خوب ان یعنی چیزهایی ک من از تو یاد گرفتم تو مدرسه یاد نگرفتم،شوخی هات هم جای خود و به موقع هستن. لهجه ایرانی هم با انگلیسیت قاطی میشه 😂👍

[@gulmirasufyanova3166]

Makes you laugh right off the bat, I love this guy.

[@mohsins.3851]

NOOOOO PLEASE MAKE ALL VIDEOS PUBLIC! THERE IS NO EXCUSE NOT MAKING VIDEOS!

[@chance1986]

Great question. And a neat demonstration of the answer.

[@Doofindork]

This is super cool knowledge. Cheers for enlightening us!

[@corwynjohnson4066]

Holy crap, first Brainiac75 and now an ElectroBOOM vid on my birthday? Fantastic.

[@darthglobe4285]

I SALUTE YOU!!! You teach so simply and beautifully that is still remember that middle finger... oh no that taught hand rule. I do share your joy of discovering such stuff out. Thanks All hail the GREAT UNI-BROW 🙌💂💂💂💂👏

[@srogers500]

Never stop doing what you do. You make my life better, brother.

[@rboth2]

such a great demonstration video, made the ideas a lot clear :)

[@4Kkonkan]

You are awesome sir, I love the way you explain any concept

[@connordow7366]

thank you so much for answering these questions. ive had the same ones for years.

[@waynestewart1919]

Never would have thought of that. AWESOME!