- #1
Marcin H
- 306
- 6
Homework Statement
Homework Equations
Amperes law
The Attempt at a Solution
This is a solution to an old exam and I am confused by the application of amperes law here.
What is the general rule for drawing our "ampere'ian surface" when using amperes law? I thought we have to draw a countour that encloses I and have it in the direction of the bfield created by I
For example, in this question, I don't understand why they drew the contour around the bottom plate like that and in the zx plane. Why is the contour like that? And why is the integral of dl just equal to w? I thought we had to sum the length of the contour. For example if the contour was a circle we would say integral of dl is 2(pi)r.