00:01
Now here we have two lines of, two infinite lines of charges.
00:05
Line like this.
00:06
Suppose one line like this, and the other one is like this.
00:13
Okay.
00:15
One of this line of charges along the x direction, and the other one is lying along the y direction.
00:24
While the line around the y direction is supposed to be negative charges, okay? uniform, and the one on the x direction is supposed to be positive charges like this.
00:37
Okay.
00:39
And the linear charge density on both lines is given by row equals five nanocrym per meter.
00:52
For the x, for the y, of course, is minus, take a minus sign, right? so that's the tegaminase minus 5 nanocon per meter for the charge, for the line of charges, line on the y -axis.
01:08
And then you're asked to find the left field intensity at the two points.
01:13
The first point is at the position, the arranging actually is not at the arranging, but actually along z -axis.
01:24
The x -axis actually is in this direction, right, somewhere here.
01:28
So that's what you need find.
01:29
Okay, that's the first point.
01:31
Let's try to find the electric field.
01:32
So first it's very clear that the electric field from the line on the wide direction must be going in this direction point toward this, like this, but by symmetry is very clear.
01:49
And that from this positive charges will actually be pushed it to the other way in this way.
01:56
Right.
01:58
And since this point is at the same distance from the positive charges and negative charges, we can be, we can be sure that the electric field at this point actually is zero, right? there's no electric field at this point at all.
02:12
And how about another point, which is located at x equals zero, y, core three.
02:17
So y core three, maybe somewhere here.
02:20
So the other point, let's look at it.
02:21
It's somewhere here.
02:23
And now it's not real at that point.
02:24
And z is four.
02:26
So so it actually is somewhere here.
02:28
So that's the point we're looking at.
02:30
This is the point is here.
02:32
We need to look at this point...