00:01
Now here you are looking at the electric field generated by two plates, right? and of course, the two plates basically are the same as a polar plate capacitor, right? so what's happening is that, suppose you have two plates, let me just try to show like this, right? you have two plates and like this.
00:22
This place, suppose they are infinite plates, okay? and with uniform charge density sigma here and minus sigma here.
00:29
So as positive sigma, negative sigma.
00:32
And it's very clear that there's no electric field in this region, this zero, zero electric field.
00:39
Okay, the electric field in this region is zero and the electricity in this region is also zero.
00:44
And the electricity in this region actually, you know, is actually simply proportion to sigma times two pi.
00:53
But you have two, so you actually signal times two by times two.
00:57
Okay.
00:58
So it's four pi sigma.
01:01
So that's the electric field in between the two plates.
01:04
And the reason why outside this is the right now course, because the electric field generated by the positive and negative charges just cancer and similar here...