AP Physics 2: 1.2 Systems Interactions and Changes

really looks like All right Well a pheromone is an

electronic musical instrument played without any direct contact It makes

a rather a spooky sound that look no hands but

one of the players hands act as a capacitor plate

while an antenna on the instrument provides the other plate

as the distance between the hand and the antenna changes

The capacitance between them also changes this intern affect the

frequency of the sound treat The thurman system is a

simple parallel plate capacitor Take a look at the following

diagram Here we go Each plate is a square with

sides of twenty one point three centimeters separated from each

other by a distance of ten centimetres A constant potential

difference of one hundred twenty volts has maintained between the

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

plate And here the potential answers All right Well whether

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

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

in this situation thea capacitance of a parallel plate capacitor

equals the electric constant times the area of one of

the plates divided by the distance between the plates to

make things easier for us which we try to do

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

area and the electric constant Well the area will equal

twenty centimeters squared or twenty times ten to the negative

second meters The distance is ten centimetres a ten to

the negative two meters The electric constant equals ten times

ten to the negative twelve And when we flug in

the numbers into our equations we find that the capacitance

equals for pico farrah capacitance equals charge over voltage which

means that charge equals voltage times capacities while for pico

frauds times one hundred twenty volts gives us a charge

of four hundred eighty pico coolant on the correct answer

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

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

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

Math We need to get another jam sesh going with

the fireman way Need to feel the music in our

bones or in this case we need to feel the

voltage in our fingers with a great sound like that

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