00:03
For this problem, we have a loop below a wire, and that wire is current given by this exponential equation, and b is greater than zero.
00:12
Our goal is to find the direction of the induced current in our loop.
00:17
So because b is greater than zero, we have an exponential decrease in the current magnitude.
00:25
So if we were to draw that, to get an idea of what this looks like, we just have an exponential decrease.
00:35
What does the magnetic field look like that's corresponding to this wire? well, we know that we have a right -hand rule for wires.
00:43
We put our thumb in the direction of the current, and the way that our fingers wrap around that wire tell us the orientation of our magnetic field at all points in space.
00:53
So above this wire, our fingers are going into the page.
00:57
So our b field is going into the page.
01:01
And below it, our fingers are coming out of the page.
01:05
And remember, out of the page, we draw with this little circle dot.
01:11
Circle dot...