ShmoopTube

00:00

Thank you We sneak and here's your shmoop du jour

00:05

brought to you by faraday cages Normally we'd be all

00:09

witty here but instead let's just see a faraday cage

00:11

in action Yeah that's way cooler than anything we could

00:14

come up with All right conductors like faraday cages are

00:18

sometimes used to shield electric fields well faraday cages can

00:22

shield up to one hundred thousand volts which is cool

00:27

It was terrifying to watch from inside one A charged

00:31

conductor with a wobbly or shape is shown Here is

00:35

there Pienaar lie on the surface of the conductor and

00:38

cue allies inside Which of the following statements is true

00:42

juice Two of these answers you're like All right well

00:50

this should serve as a reminder Don't sketch conductor designs

00:54

at three A M if you do they might uh

00:57

a little wonky but that's Okay we can work with

01:00

wonky well let's take a closer look at the three

01:03

points in this system Point p is on a wide

01:07

part of the conductor point are is that a narrower

01:10

part And q uh is in the middle surrounded by

01:13

the conductor conductors like this direct current around the material

01:16

preventing anything or anyone inside of the conductor from getting

01:20

zapped which is a really good thing if you're the

01:22

one in the cage If you're in the middle you

01:24

can relax knowing that the electric field where you are

01:27

is zero So b is one of our correct answers

01:30

Now we're looking at the outside at points pienaar at

01:33

the narrow part of this misshapen thing The radius of

01:37

the curve is smaller and at the risk of pin

01:39

obvious on that point P the radius is larger Yeah

01:42

that's right We're risk takers like that At a point

01:45

of smaller radius The electric field lines will be closer

01:48

together resulting in a stronger electric field So the other

01:52

correct answer is a answer D is exactly the opposite

01:56

of what we're looking for It's out the window Oh

01:59

and see if that's a No because feel that the

02:01

surface of a conductor has always perpendicular to the surface

02:05

Not parallel and conducting cages not only looked really cool

02:09

in a lab but they're pretty important In the real

02:10

world For example airplanes are faraday cages which is why

02:14

a plane can get struck by lightning without passengers inside 00:02:18.183 --> [endTime] getting all of crispy

Full Transcript