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Commit 92202eac authored by Erik Strand's avatar Erik Strand
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Answer 7.2

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......@@ -28,6 +28,14 @@ to go, though not all shields are grounded.
Salt water has a conductivity ∼4 S/m. What is the skin depth at $$10^4$$ Hz?
$$
\begin{align*}
\delta &= \frac{1}{\sqrt{\pi \nu \mu \sigma}} \\
&= \frac{1}{\sqrt{\pi \cdot 10^4 \si{Hz} \cdot \num{1.3e-6} \si{H/m} \cdot 4 \si{S/m}}} \\
&= 2.5 \si{m}
\end{align*}
$$
## (7.3)
Integrate Poynting’s vector $$P = E \times H$$ to find the power flowing across a cross-sectional
......
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