00:01
All right, so let's say we have a cylinder with a radius of 4 .7 centimeters, and it has a linear charge density, which we're told is 86 nanoculams for every three meters.
00:16
So, all right, that's right as 28 .67 nanoculams per meter.
00:24
We want to know what's the electric field strength, three centimeters from the axis of the cylinder.
00:28
So it will be inside the cylinder, and we're told the charge is evenly distributed throughout.
00:34
So gauss's law says the electric field at our little gaussian surface, which we can draw to be the exterior of this little interior cylinder, if that makes sense.
00:50
So the electric field times the surface area of that, which is 2 pi r times l, is equal to the charge enclosed by that region...