Electric displacement field
= Electric displacement field
{title2=$\mathbf D$}
{wiki}
The electric displacement is $\mathbf D=\epsilon_0\mathbf E+\mathbf P$ and obeys $\nabla\cdot\mathbf D=\rho_{\rm free}$. In a linear isotropic dielectric, $\mathbf D=\epsilon\mathbf E$.