00:01
Let's take a look at this simulation, this fet simulation on an electric field.
00:08
Even if you watch me answer these questions with the simulation, i really urge you to go in and play with it because i think you learn a lot more by doing it yourself.
00:16
So we need the measuring tape and we need to click for voltage and values.
00:22
And then we're going to have a positive charge and measure and we're going to place the sensor in different locations.
00:30
Okay so the length of the electric field experienced by the sensor let's see what we have going here's a positive charge and we're going to go we're going to go 50 100 150 and 200 centimeters away so i think i'm going to move the i'm going to move the charge so that i have more space all right so here we go so let's go, well, hang on.
01:17
Okay, at 50 centimeters, i'm measuring an equipotential or a voltage of about 12.
01:25
So we're going to, it says length of electric field experienced.
01:29
I think this must actually be asking for the strength of electric field.
01:33
And so i'm going to say 12 volts because the distance or the length is 50.
01:42
So let's assume that this is actually asking for the strength of the electric field.
01:46
Okay.
01:47
So 100 centimeters.
01:48
Let's go back.
01:50
And i'm going to change the length to 100.
01:52
So here i have it set as close to 100 as i can get it with the simulation.
01:58
And i'm getting about 7 .6.
02:01
So let's put 7 .6 volts in for 100 centimeters.
02:11
And let's go to 150.
02:12
All right, here at 150, we get a voltage of about 5 volts, 5 .2, we could say.
02:36
And at 200, let's make this 200 centimeters away.
02:52
And at 200, we're getting about 4.
02:57
We could say 4 .1.
02:59
You know, depending on how close you set it, these are going to be plus or minus a tenth of a bolt or.
03:07
So okay so the next one asks us as the distance of the sensor from the charge increases what happens to the strength so this is supposed to say strength of electric field and um knowing that it's supposed to say strength hmm electric field strength is actually measured in volts per meter here so i'm going to go back and i'm going to figure out how many volts per meter at each of those distances here at 200 centimeters i have 1 .9 volts per meter and so i think that this is actually asking for the strength of the electric field so we probably don't want those raw voltages as much as we want electric field strength let's go to 150 here at 150 centimeters the strength is about 3 .2 volts per meter let's look at 100 at a distance 100 meters away, we get an electric field strength of 6 .2 volts per meter.
04:42
And then let's look at 50.
04:47
At a distance of 50 centimeters, i'm measuring electric field strength to be 17 .7 volts per meter.
05:02
So i think that the second values for field strength is what you're actually being asked here.
05:08
This should say strength of electric field.
05:10
I'm guessing in volts per meter because it says to use the sensor.
05:15
So i think there are some typos there.
05:18
So i would say use these values, not those values.
05:24
So answer these questions.
05:25
As the distance of the sensor from the charge increases, what happens to the strength of the electric field? here we have increasing distance.
05:35
So as we go down, distance increases.
05:38
But look at, we've gone from 17.
05:41
Down to about two.
05:43
So we're going to say as distance increases, electric field strength decreases.
05:58
And it actually decreases as a square of the distance...