00:01
So in this question, you're giving a share, right, insulating share, which let me indicate.
00:13
Again, this has two radius, of course, the inner radius, which is this, and the outer radius.
00:23
So the inner radius, let me call it error.
00:27
Okay.
00:28
And that has a value which is 10 centimeter.
00:33
And then the out radius, let's say it's have different value, which is here, capital arrow, and that's 15 centimeters.
00:43
And then, sorry, i'm not going to give to you, let me call this not a little arrow because that would be the same as the distance.
00:54
Let me give a different name, call it our in, okay, and this is out, okay? so and then you're and then of course on this share distributes uniform distributes how many charges.
01:10
The total charge distributes on the share is q right, which is 16 .2 as a column.
01:19
Okay.
01:19
And you asked what is the magnet of the electric field at a distance? are equals 11 .2 centimeters from the sand of the share.
01:29
So that's a point for example here, right, inside the share.
01:35
And you can imagine that the electric field, due to the symmetry must be uniformly, i mean, the electric field must be the same on this circle, right, anywhere on the circle because of the symmetry.
01:50
And you see that if you look at the electric field lines, you must go radiated.
01:55
This symmetric as well.
01:59
And to really get the electric field at the point, suppose the electric field at this point, i call it the e, okay? and then you look at the flux of this electric field through this sphere, okay, with radius arrow.
02:17
Then the flux, we are called phi, which is a real scheme by four pi hour squared...