00:01
Okay, a coexio cable has an inner wire carrying a current of 10 amps into the page, and an outer sheath carrying a current of 10 amps out of the page.
00:09
Calculate the magnetic field, 1 centimeter from, let's see, at a distance 1 centimeter using amper's law.
00:18
This point is inside the cable, and then calculate the field at a distance 10 centimeters outside the coax cable.
00:26
Okay, so it's kind of hard because we don't know the dimensions of the cable, but we can try it.
00:39
So there's the...
00:41
Just do it in two different colors.
00:48
So this current is going into the page, right? and then this current is coming out of the page.
00:58
Okay, so, like i said, we don't know how large this inner piece is, and we don't know how wide this outer piece is.
01:09
We don't know these distances, so it's really hard to say.
01:13
But the problem statement makes it sound like we're probably calculating the magnetic field somewhere in between the two cables, which is fairly easy.
01:28
So ampher's law will just use it as they've written it, b2 pi r equals mu not times the enclosed current.
01:40
So for this first situation, we're using the ampyrean loop that i've drawn.
01:48
Drawn in the blue dotted, and that's at a distance r away, 1 centimeter...