Field Inside Matter
Analogy: Rotating Spherical Shell ($\sigma R \omega \to M$).
Surface Current $\mathbf{K}_b$
Field $\mathbf{B}$
Inside field is Uniform and Parallel to $\mathbf{M}$.
$\mathbf{B} = \frac{2}{3}\mu_0 \mathbf{M}$
Analogy: Two overlapping charged spheres.
Surface Charge $\sigma_b$
Field $\mathbf{E}$
Inside field is Uniform but Opposite to $\mathbf{P}$.
$\mathbf{E} = -\frac{1}{3\epsilon_0} \mathbf{P}$
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