AP Physics 2: 1.2 Systems Interactions and Changes

AP Physics 2: 1.2 Systems Interactions and Changes. What's the approximate magnitude of the charge on each plate?

AP Physics 2Systems Interactions and Changes
LanguageEnglish Language
Science Practice 2Using math appropriately

Transcript

00:17

really looks like All right Well a pheromone is an

00:20

electronic musical instrument played without any direct contact It makes

00:24

a rather a spooky sound that look no hands but

00:29

one of the players hands act as a capacitor plate

00:31

while an antenna on the instrument provides the other plate

00:35

as the distance between the hand and the antenna changes

00:38

The capacitance between them also changes this intern affect the

00:43

frequency of the sound treat The thurman system is a

00:46

simple parallel plate capacitor Take a look at the following

00:49

diagram Here we go Each plate is a square with

00:52

sides of twenty one point three centimeters separated from each

00:55

other by a distance of ten centimetres A constant potential

00:59

difference of one hundred twenty volts has maintained between the

01:02

plates What's the approximate magnitude of the charge on each

01:06

plate And here the potential answers All right Well whether

01:11

we're dealing with a somewhat dorky musical instrument or just

01:16

too boring electric plates There's an equation to determine capacitance

01:20

in this situation thea capacitance of a parallel plate capacitor

01:24

equals the electric constant times the area of one of

01:27

the plates divided by the distance between the plates to

01:31

make things easier for us which we try to do

01:34

in all circumstances let's use multiples of ten for the

01:37

area and the electric constant Well the area will equal

01:40

twenty centimeters squared or twenty times ten to the negative

01:43

second meters The distance is ten centimetres a ten to

01:48

the negative two meters The electric constant equals ten times

01:53

ten to the negative twelve And when we flug in

01:55

the numbers into our equations we find that the capacitance

01:58

equals for pico farrah capacitance equals charge over voltage which

02:04

means that charge equals voltage times capacities while for pico

02:09

frauds times one hundred twenty volts gives us a charge

02:12

of four hundred eighty pico coolant on the correct answer

02:16

is a when we're dealing with capacitance we're going to

02:19

be seeing these super tiny numbers It'll be pico and

02:23

nano for rods all over the place But that's enough

02:26

Math We need to get another jam sesh going with

02:28

the fireman way Need to feel the music in our

02:30

bones or in this case we need to feel the

02:32

voltage in our fingers with a great sound like that

02:35

It's Hard to believe the thurman really never caught on 00:02:38.745 --> [endTime] No