일반물리학 2 — Maxwell's Equations; Magnetism of Matter: Problem 38

38 A capacitor with square plates of edge length $L$ is being discharged by a current of $0.75\text{ A}$. Figure 32-27 is a head-on view of one of the plates from inside the capacitor. A dashed rectangular path is shown. If $L = 10\text{ cm}$, $W = 4.0\text{ cm}$, and $H = 2.0\text{ cm}$, what is the value of $\oint \vec{B} \cdot d\vec{s}$ around the dashed path?