00:01
All right, so here you have a long loop i, carrying current i.
00:12
You have three loops, this long wire carrying current i and three loops beside it.
00:18
One loop a going parallel to the wire up, parallel to the wire up, loop b, which is going to the left, and loop c, which is going to the right.
00:32
And so you have to figure out the direction of the induced current, if any.
00:37
And part a, as you can see, the motion of the wire is parallel to the loop.
00:42
So there's no induced current.
00:45
You got to have an angle between the loop and the magnetic field that's not happening.
00:52
And so no induced current.
00:57
And part b, what you have is, and so what's going on here is that, the magnetic field loops around like this, right? so that's b.
01:10
That's b.
01:11
So here, your field strength when it's, so your field strength out of the page is actually decreasing and these will denote out of page.
01:22
Your field strength is decreasing when you're moving further away from the loop.
01:26
So what you want by lens's law is that your field strength should go up out of the page, to counteract this change...