How do Signal Blockers Work? (Faraday Cages)

[@madness1931]

When I was at school, the entire place was a Faraday Cages, because it was refurbished from an old bomb shelter. Nobody, and I mean nobody could get a signal unless you were outside.

[@ExpiredCartonOfEggNogg]

Madness1 useful for stopping kids going on their phones

[@valhar2000]

That is an excellent idea for a school!

[@gokudoge7588]

Lorenzo Benito It’s actually illegal if you can’t dial Emergency services in a building.

[@jprobe]

@@gokudoge7588 That is what land lines are for. Schools have them.

[@mastersergant1287]

@@jprobe good ol land lines, still got a rotary phone here

[@ivomo_]

No intro finally!!

[@jakesimm5889]

Ivo it'll be back.

[@JonatasAdoM]

They might have forgotten it

[@livelaughliao]

lol u are right...

[@lykourgakhs]

Why finally? There was nothing wrong in the intro!

[@ThePsEuDoAnOnYmOuS]

in other words - no instant dislike :D

[@Raress96]

So you got continuous sponsorship from Jibo I see?

[@imbadwrench]

I live in a Faraday Cage. there are 2 to 3 layers of foil backed foam insulation over my entire house and the seams and corners are mostly taped also. When my parents built the house we had to take 2 screens off the windows facing the cell towers for cellphones to work inside the house.

[@imbadwrench]

we now have new non metal screens

[@avi12]

Now I understand the science behind why "it's not recommended to have a phone conversation inside an elevator" Thanks, Linus!

[@Ceielo]

0:36 I absolutely lost it at Festivus Pole. Thank you, whoever wrote this.

[@h7opolo]

I love the thoroughness of the explanation and examples and the gratuitous animations. great vid, yos.

[@unvergebeneid]

h7opolo, yes, it's thorough. It's also completely wrong, but hey.

[@h7opolo]

i disagree. please elucidate the shortcomings for me. ty.

[@unvergebeneid]

h7opolo, "electric fields push charges away from them." Uhm, depends on the charges and more importantly on the fields. Linus also didn't just misspeak, the animation shows a vertically changing field exerting a static force in the horizontal direction of the wave's propagation. What's that supposed to be, radiation pressure? Also, no word on the fact that EM waves need a minimum frequency for a given Faraday cage to work on them, which is especially important in case the whole explanation was meant to look at a static case.

[@h7opolo]

He did state that the electric field was moving in a negative to positive direction which repels positive charges, so your first point is moot. For your second point, would the animation be more correct if the arrows and field lines pointed up and down instead of left and right?

[@unvergebeneid]

h7opolo, maybe you should watch the video again. He not only doesn't say what you're saying there, he also said that electrons are drawn towards the signal source. That's total BS. And even if he'd said what you're saying, it _still_ be wrong by 90 degrees. Sorry, but I can really find nothing redeeming about this explanation. The animation seems to mimick the one from Wikipedia, only that that one's not wrong. So go to Wikipedia everyone instead of watching this video.

[@ComixsYT]

How much did Jibo pay for you to wear that shirt the past few videos?

[@StormCrusher94]

Don't steal my questions

[@ChronicallyAnxiousChicken]

Is this why my grandma lives in a metal trailer, so I can't be on my phone when I visit? Lol

[@Colaglass]

No, that's because the financial situation of the average person in America is fucked.

[@2SNesbit]

Back in the (mainframe) days, a data center was built at an air force base in the state where I live. Unfortunately, when they activated it, the (large) disk drives would periodically have voltage spikes and drops causing problems. It was discovered that the ground control radar for the airplanes periodically swept the building in its circular sweep. The initial and temporary solution was to wrap the building in chicken wire which seemed to work until a more permanent solution could be implemented.

[@DreDurezza]

Great video! Straight to the point and contained all the information I needed to remedy some issues I'm having with a current project! Cheers :)

[@catgirlinspace]

5:20 Such a smooth shirt transition...

[@Minty_Mentos_]

Dog2puppy MCPE damn

[@kyle924]

Love your videos, they have inspired me to start building my own pc's

[@divyashreem9899]

Great explanation with real-time applications of faraday's cage.... Thanks for sharing.... Good luck....

[@siriusplayz5871]

Hey Linus, I'm a huge fan. Always watch all your videos regularly. I have a request. Please make a detailed video at this topic. How does the international space station orbit around the Earth. Its movement, mechanism, procedure and route etc. I have heard some crazy things and can't understand them without any visual aid. I love space, I hope my request falls on your (Specifically your) teams ears. Much respect for you and your whole team Lines. Thanks :)

[@ri8c]

Thanks for removing the loud intro. My ears appreciate it. A lot.

[@udenszirnis1644]

And now we wait for ChannelSuperFun episode on them trying to make a internet-free tent on their own.

[@SmoothBob]

thanks linus, this is exactly what i was looking for!

[@VeVe_AR_Guy]

Happy festivus for the rest of us!

[@chrissosexybaby]

You make good content and I appreciate your videos.

[@alejandrocespedes1544]

Thanks for helping me with my final, Linus! Love your videos

[@JodBronson]

I have been sleeping a a Faraday Cage for 2+ years. I can tell you, that when I wake up..... I feel relaxed and get a lot of Energy. I also only sleep 4+ Hours per day. Although I try to get my 8 Hours daily, but somehow I get so much Energy, I only need about 4+ Hours. NOTE: I have a video in my Channel about my Faraday Cage. If you can't find it, you can easily search on KZbin Search Term: Jordan Bronson Faraday Cage

[@SouravTechLabs]

4:44 I use Linux Mint OS on laptop, and desktop, and Raspbian on raspberry pi , and I love synergy! It's so awesome...

[@olajideparis]

I love that you are rocking the Jibo shirt.

[@vgamesx1]

I gave this one a like and a comment just for not having that outro at the beginning.

[@opm-sriram2070]

love Techquickie!!!

[@majdbag7203]

Time for the airing of the grievances! Thumbs up for a festivus for the rest of us!

[@KeithAinsley]

Reminds me of my pager repair days. Used the cage to block all signals to adjust sensitivity.

[@DG-zu4iy]

your so funny! thanks for that explanation with a dash of laughter!

[@AmanSharma-fr4uu]

Awesome video on an awesome topic..

[@RHCroeihardcool]

THEY GOT RID OF THE INTRO GUYS YESSS

[@conston]

yippeeeee

[@dive_whale]

They did??????? Man, I so used to it, I didn't even notice it anymore.

[@JonatasAdoM]

+Ken Liu (_Whale_) ME TO!

[@livelaughliao]

IT WILL BE BACK!

[@dive_whale]

oh shit

[@vojislavS8652]

Thank you Linus!

[@misuzu8814]

yes the intro is gone

[@Redrumm]

The KFC bit at the end LOL 😂 thx man needed that laugh

[@bushmonster9899]

Linus, the best conductor is the best obstruct (elements with low magnetic permeability).

[@Sakibmanzoor-m4u]

No wonder why I highly honor Michael Faraday .

[@xnight.shadex]

Speaking of block signals why not block your IP address from the eyes of the internet with *TunnelBear!* The free VPN app that allows you to browse then web privately and secure with its 256 bit encryption. You can tunnel your IP address to any country around the world and start bear-owsing as if you were *in that country.* Check out the link in the description.

[@aidanmoyer7066]

Nice shirt bro!

[@DrMKUltra007]

So is it put a positive charge on one side and a negative on the Other? would it have to be at a certain frequency level or how about imputing Audio current into it?

[@mouurusai]

1 Wrap the mobile phone in foil 2 Call this phone 3 You hear a ringtone What am I doing wrong?

[@KarlWork-n3i]

As an example you could make a" Faraday cage" out of mirrors and asked what radiation gets thru. But it's not a Faraday cage but would block some signals and not block other signals reflection and shielding different things going on

[@westharpe2692]

Hey, I've often considered having "faraday material" built into home walls to prevent the 100+ wifi signals in my neighborhood from confusing my router...lol, but seriously!

[@texasdeeslinglead2401]

You and that dang jibo magic eightball shirt.

[@jesse-dg8yx]

I guess my parents are going to try and find a Faraday cage big enough to be my bedroom :(

[@OldFormat]

Another way to think about this is the cage acting as an antenna. The antenna is driven by the incoming signal and emits a signal 180 deg out of phase into the cage and in phase back at the source reflecting the signal back like a mirror. A lot of lower level physics textbooks actually get this wrong and describe the process as the free electrons in the metal moving and then having their energy dissipated by resistance.

[@ChiliPod-zt6ib]

Hmm, can any of you give any tips against laser weapons? Nice to know ...👍

[@davidnorell]

interesting information. I wondered why in Walgreens Stores why When i got past the front door i had no bars. there we go!

[@tamascoleman]

How long have you been wearing that Jibo shirt

[@TheElectroclassic]

2 monhts? lmfao

[@Hirvee5]

That was interesting. Thanks

[@willharris8632]

I guess Linus did a mass of videos before ces in one day?

[@kidnamedfinger6323]

Wow, Linus really likes his Jibo shirt!

[@rajdeep.saha_]

KFC part was hilarious bro😂😂extra gravy lol

[@mmesuena]

how many of these did you guys shoot while he still had the jibo shirt on?

[@RandomNoob]

It was probably part of the pay deal that was struck after the unfavourable review that he wears it for x amount of video's

[@brianegendorf2023]

I have a question. I get that the Farady keeps electricty from getting to the inside or to the outside of the cage depending on where it originates from. But does the em field change shape to the extent that something powerful enough might not send electricity outside of the cage, but it still might bend space? And vice versa?

[@Henchman1977]

I do believe those were ink security tags not rfid.

[@juanthefreak331]

linus is still right

[@DonaldHendleyBklynvexRecords]

Why Do We Love Linus And Jibo Together? Idk But We Do 💕

[@RAGHAVENDRASINGH17]

Great explanation linus, but i knew it before

[@sergiowolfpac]

If you want an escape from your phone, rather than buying the KFC Faraday Tent, smash your Iphone X to pieces, and buy a new one later. Repeat up to 4x and it'll still be cheaper than what KFC is selling. (assuming you sell your broken iphone for parts)

[@dive_whale]

Or... if you have a cheaper phone, you can buy more than 4 times (maybe.)

[@stupid_tree7158]

My physics teacher shows us her wifi blocker she made from scratch. She never used it, but she did threaten my class with it. She said it would only block the wifi in her room too. 😅

[@trikstari7687]

Okay Linus, you get a thumbs up for the festivus reference.

[@gloid4051]

HAPPY FESTIVUS!

[@benoitcloutier6228]

Hi Linus, I live in a condominium and I see anywhere form 15 to 20 Wi-Fi signals coming into my home. All of which are competing/searching for open channels. This is happening both on the 2.4 GHz and 5 GHz bands. Needless to say, wifi performance is significantly hindered as soon as I walk away from my SOHO router. Since I live on the top floor, I thought I would tare the flooring and install a wire mesh, like a carpet, before reinstalling the whole thing. What do you think of my idea? Do you think it would work? Ben

[@fakjbf3129]

Should I be worried about KFC somehow turning into an electronics retailer?

[@chingguskhan8774]

Yes lol

[@333dae]

>nature's unintentional faraday cage >the elevator

[@flameshana9]

>Nature's

[@ehteshamkhan2977]

Is this really a linus' new channel?

[@TheManLab7]

For it to work best it needs to be grounded. I’ll be getting a new car shortly and I made sure that I DIDN’T want it to be keyless. I still want to put a key in the ignition to start to car even though they can probably pick up the key to unlock the car and plug into the OBD-II socket then they could start the car that way. I’ll be keeping my keys in an earthed metal box e.g. microwave or anything else that’s completely shielded. There’s a place close to me that do items for fast jets and commercial aircraft and they’ve got a faraday cage that can fit a double decker bus with room to spare!

[@hobbes3206]

Can we all appreciate the festivus joke around 0:40

[@danbrayton7031]

Lol the Jibo shirt

[@r_gos]

For the sake of accuracy the radiation produced cannot enter the faraday cage but continues across it as in the space inside the cage is isolated

[@Dieze]

this should depend on the wavelength in relation to the size of the faraday cage though, no?

[@vnyggi621]

The explanation we learned in school was entirely different than in the video: if the metal bar is parallel to the electric part of the wave, the electrons in the metal move up and down along sending a em wave on their own that cancels the original one out by interference

[@mitchellshultz9327]

So you mentioned that the frequency of the sound wave actually determines whether or not the signal will pass through a hole in the faraday cage. However I do not understand how this works. My forward thought is that the wave will pass through based on the magnitude of the sound wave, not the frequency.

[@SilkroadAllDay]

i think he's in love with jibo now..

[@chadanooga]

Omg I thought I was listening to the church lady on SNL!! Haha!! 🤣🤣

[@kyle8086999]

nice jibo shirt

Whats with the air quotes shield?

[@grebandcunha866]

Did they forget the intro on this one, or got rid of it?

[@johanleksell8044]

Greban Dcunha hope so its annoying

[@DanyDM_98]

0:45 that explanation is wrong, that explains how they work in electrostatics regime. What actually happens is that the electric field oscilates (due to the nature of the electromagnetic radiation itself), generating oscillating currents inside the conductor, witch dissipates energy by Joule effect.

[@hunterbowman5150]

I seriously wish I could turn my apartment into a Faraday cage. All of my neighbors use dual band routers. The 5gz channels are all super congested, and the way my apartment is set up, we are close enough that their WiFi signals are strong/close enough to interfere a crap ton with mine....

[@Layarion]

i'm thinking, you could hang metal sheets on the bordering walls...not sure if i understand it enough though.

[@falfiya]

Was the cut at 0:10 intentional (because crude)?

[@BenjaminWheeler0510]

Theory: Jibo was mad that he dissed their robot and forced him to wear their shirt in every upcoming video and make an updated video at CES

[@LawatheMEid]

the holes must be smaller than wavelength or amplitude?

[@jackpietro3475]

I worked in a nuclear facility for 10 years. AT&T is the only provider in which a cell signal can penetrate 2 feet of concrete. Not sure why they don’t market it that way.

[@AzKat69]

Ah, the anti-theft signs... some shops have them, but they don't have devices to remove them, so it will "beep" while you walk through the anti-theft gate no matter what you do. (yes, I was talking about having the receipt for them, proving that you paid for them). There's a store called "Profi" that does this.

[@sherrysunshine6986]

Does it matter what type of metal?

[@JodBronson]

YES. Because of density. Sorta like the Olympics... Gold, Silver, Bronze, etc...

[@vincenttjia]

Nothing demonstrates this idea better than an EMP BOMB.

[@Rozkrwawiacz]

So cage made of net with spaces smaller than wave length, which means about 1foot (30cm) for blocking cellular network, right?

[@JodBronson]

I have been sleeping a a Faraday Cage for 2+ years. I can tell you, that when I wake up..... I feel relaxed and get a lot of Energy. I also only sleep 4+ Hours per day. Although I try to get my 8 Hours daily, but somehow I get so much Energy, I only need about 4+ Hours. NOTE: I have a video in my Channel about my Faraday Cage. If you can't find it, you can easily search on KZbin Search Term: Jordan Bronson Faraday Cage

[@RamblingTechnician]

Worth noting not all metals act or in this case blocks equally.

[@Denstoradiskmaskinen]

Copper mesh inside the walls, does the job, to block signals? Cheap and effective for those with electromagnetic hypersensitivity ?

[@adarshadan]

Still rockin that jibo shirt ! 😂😂

[@pdroa6666]

yay good content

[@CallOfDutyProOwner]

The “shield” on my MacBooks cable has fallen off.. is that bad? Seems to work

[@robbieabbott5995]

looks like you need to test out the fareday tent lol

[@ramzymohamad8057]

Your add appeared an your video at the end thats crazy

[@jeannedarc8580]

Do Faraday cage protect your phone of data collection, but by inside apps ? (like : if I put my phone on a Faraday cage, can Google still collect my personal data ?) Sorry if my English is bad, I'm french 😁

[@JodBronson]

I have been sleeping a a Faraday Cage for 2+ years. I can tell you, that when I wake up..... I feel relaxed and get a lot of Energy. I also only sleep 4+ Hours per day. Although I try to get my 8 Hours daily, but somehow I get so much Energy, I only need about 4+ Hours. NOTE: I have a video in my Channel about my Faraday Cage. If you can't find it, you can easily search on KZbin Search Term: Jordan Bronson Faraday Cage

[@nithssh]

Wow, no sponsor transition that goes "speaking of "

[@ShadowLinkxMaster]

Linus wearing a Jibo shirt.

[@Richard-tf6oq]

Festivus pole !!

[@simplySwag7567]

i know linus as a tech youtuber. So i dont know if i can trust him for physics.

[@neilansiva6007]

Could you please tell me a solution for the HP STREAM 7 TPM issue?

[@vman049]

Does the cage have to be grounded?

[@JodBronson]

YES, the Cage MUST be grounded! I have been sleeping a a Faraday Cage for 2+ years. I can tell you, that when I wake up..... I feel relaxed and get a lot of Energy. I also only sleep 4+ Hours per day. Although I try to get my 8 Hours daily, but somehow I get so much Energy, I only need about 4+ Hours. NOTE: I have a video in my Channel about my Faraday Cage. If you can't find it, you can easily search on KZbin Search Term: Jordan Bronson Faraday Cage

[@moritz-xe6nr]

and what lets say if you have your own quantumphysics lab in your home in a room and this room has to be shielded from every incoming waves and you dont have put a faraday cage around the room. Whats the best solutions ?

[@BluetomatoCh]

Just take your room and put it about 3000m down under the surface. (search for GALLEX)

[@moritz-xe6nr]

any other solution idea then that one :p ;D

[@bobbobson5595]

Put it in the boiler room

[@slendermanRblx]

How do ferrite cores work on cables

[@michaelariori8470]

4:30 Notification bling!