Electrostatic shielding & Faraday cage | Electrostatic potential & capacitance | Khan Academy

Let's explore why electric fields cannot penetrate a closed conductor. This makes a closed conductor shield the inside from outside electric fields. They are useful in protecting sensitive electronic equipment's from stray fields. This effect was first studied by Michael Faraday, and hence closed conductors are often called Faraday cages.
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Created by Mahesh Shenoy

[@sujal438]

He doesn't just read scripts. He Actually Explains stuff. Really great explanation. Thank u Khan Academy❤

[@barbaramaj1919]

only he got it wrong. Electrons are the negativity in the atom, so a negative charge is associated with overabundance of electrons, not a positive.

[@kumaran4845]

It's really heartbreaking to see Khan academy India get very less views

[@rbkstudios2923]

Don't worry We are Indian students, we won't watch any video until it specifically mentions "for JEE" or "for NEET"

[@nishaprakash2592]

@@rbkstudios2923 very very true

[@sanchi7410]

Ikr

[@randywa]

I love the subtle enthusiasm behind his words lol

[@madurangan1477]

Mahesh sir you are just Rocking. Keep Rocking views are soon gonna fly through the roof. Hat's off to your content quality. I've heard that light from some of the brightest stars far in our universe takes a very long time to reach the earth, you are such a star and I guess your light haven't reached many yet, but soon it'll.

[@Mahesh_Shenoy]

That's beautiful!

[@nirajanyadav6696]

Sir whatever..... Really great and deep explanation

[@arushigautam2062]

Worth watching for sure.....

[@divyashreem9899]

Great understanding of the concept....thank you Sir 😊

[@Parapresdokian]

I may be in school, but oneday or someday I'm gonna adopt Khan Academy and Mahesh with all the fortunes they taught me to earn.

[@krazykanpuriya]

Fantastic explanation!

[@anviagrawal3170]

Worth watching all your videos Every time you say try at your own I do try it and it makes the concept last forever

[@dinleepound9466]

amazing!

[@mmohan1697]

Great lecture

[@honestman276]

Nice representation. Thanks from Bangladesh.

[@riponmridha7403]

Thanks for new video.

[@mohamedirfan2816]

Understood 👍

[@NigalyaIllangovan-vl8xw]

Its so useful❤

[@yashasvishrivastava4180]

Just wow

[@furiousarpan7473]

You're the greatest to teach this subject 🐐❤️

[@cola5323]

I love this man 🥺

[@alikhaled844]

❤❤ thank you!!

[@shamirajsurvase8032]

Well why won't the lightning charge keep on moving due to momentum? I like ur videos

[@user-ux1xg3mv4l]

Thanks for this very helpful video :) but I have a question: What happens to the excess positive charge?

[@krittikasarkar6989]

The best!! ❤️❤️💯💯💯

[@shyamraiyani6954]

Super super... Se bhi uper explanation 👌👌🙏🙏😁

[@SantoshKumar-ie5nm]

Thanks sir ur explanation is nice😄😄

[@calicoesblue4703]

Thanks bro😎👍

[@sanchi7410]

Thankyou

[@agrajyadav2951]

OH MY GAAWWDDD! THIS IS CRAZY MAN

[@mr.haroon938]

Jazakallah

[@farhanakarim8475]

A bigggg thankssss all my doubts get solved. Thanks for this kindaaaa content ❤️❤️ from Bangladesh 🇧🇩

[@joynabtahmina282]

Hey! I'm also from Bangladesh.In which Institute do you read in now?

[@mrfarooqkhan8454]

Man he is a goat ❤😊

[@r.p.blifestile8088]

How can you transfer +vecharge from a neutral point Golu?

[@iamthestrongest007]

The fact that there are girls caged inside just to get electrocuted is insane. i bet this picture was from the early 16s

[@user-zr6fs1qd3l]

I lived in a Faraday cage in San Jose.

[@joynabtahmina282]

1:35 Why we want to be in electrostatic condition?

[@deathlockcops7875]

Electrostatic condition means the charge is not moving so it explains that force exerted by external electric field cancels out force exerted by induced electric field

[@astroid9087]

If the person inside the cage touches ground will current pass through him?

[@joseksonsilva8332]

How do I ensure that electromagnetic fields pass through the Faraday cage?

[@ChandaKumari-mk2mv]

My doubt clearing after an 2 hr

[@uniteverse]

❤❤❤

[@jameslimary755]

Great explanation. A few things I haven't managed to process : - these steps seem to apply to non-closed conductors, but I assume they don't; why not? - I would have thought the moving charges in the lightning stike would disrupt the electrostatic state of thr conductor, so how do we know the potential remains uniform? Thanks to anyone who can answer these!

[@prernathakur2585]

the potential of the conductor remains uniform that is zero at all cases bcoz the dielectric constant is infinty (very high) therefore it doesnt get charged and any lightning that strikes the conductor basically moves towards ground ( 0 potential)

[@poonamramawat7637]

If the charges begin to move ,magnetic field comes into play

[@curiousme5931]

@@poonamramawat7637 if the charge sredistribute themselves like positive outside ngative on the other side net chrage on surface should be zero in sphere so doesnt that mean electric firled would also eb zero but that is not the case it is kq/r2 could u pls explain

[@cola5323]

What if the person inside the cage wraps their fingers around one of the bars? Would they get electrocuted?

[@darkrai2065]

Nice video mahesh sir ...pls cover shm in next chapter....🙏

[@ifyhu92]

I have a question: When the girls get into the cage, and close the door and they increase the voltage and a electrocute happens, then how can it be an electrostatic condition?

[@Prathmesh_P_Agarwal_1507]

why the conductor should maintain the electrostatic condition ??

[@vivekgupta3692]

*_Summary Of The Video :-_* *Electrostatic Shielding* * A person standing inside a metallic cage doesn't get hurt. * Metallic cages are basically conductors. * In electrostatic condition electric field inside a conductor must be zero. *NOTE* - Above is true only for a conductor. * Because of electric field everywhere is zero that means our entire conductor must be in equipotential. * Work done in moving a charge inside a equipotential surface is zero. * Electric Field is always perpendicular to equipotential) surface. *What happens when a lightening strike to cage?* * Lightening basically is charges moving inside an electric field. * person inside a metallic cage do not get any shock due to lightening because electric field inside cage is zero and charges can not enter inside . * Above effect is called Electrostatic Shielding. * First discovered by Michael Faraday. Also called *Faraday Cage* *An Airplane also act like a Faraday Cage.

[@Quwucuqin]

Lemme correct you its electro magnetic field cause electric field or magnatic field doesn't have any electrons flowing it's electro magnatic field electro and magnetic field is constant it's the force of our universe electrons don't even move by themselves electromaganetic fied and electrons moves simultaneously creating current.

[@VVB19857]

Sir ...very nice & beautiful explanation...pls let me know the faculty name to follow ur videos

[@yash1152]

lololol

[@shaguftafahmeed6587]

What about cavity man, no one seems to answer it

[@dtm765]

Inside a metal sphere, a person touches a negatively charged wall and there is no movement of electrons in his palms? What if there is a hole in the metal sphere?

[@padmavathivedavalli2639]

I think if there's hole in the wall then net electric field inside the conductor will not be 0 causing the person to get electrocuted

[@ananyarani7011]

But aeroplane is in air that means it's not touching the ground so where those charges go in this case

[@nehasreeraj600]

The charges just exit back into the atmosphere.

[@agrajyadav2951]

MICOOL FARADAY

[@worm_hole]

there is thing that i dont understand. we say that this is a electrostatic condition so electrons cant move then how can we imagine that negative and positive charges get accumulated and create a electric field contrast to other field?

[@Prathmesh_P_Agarwal_1507]

same doubt

[@AkChiVibes]

I believe she’s happy just to meet Harry Potter

[@txering9868]

Then is it wrong that electric field can't penetrate through metals? here because electric field penetrates and cancel each other....

[@d-code12]

Sorry sir,you are wrong

[@calicoesblue4703]

Explain ?🤷🤦

[@andriaandria6037]

siri xAR BOZO

[@karthikchowdary4184]

sir a biggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg thank you from the bottom of my heart, i had just one doubt regarding the equipotential surface which gor me so frustated because i coudnt find the answer anywhere. after watching this video my doubt got cleared. once again thank youu