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\section{Kontinuitätsgleichung}  $$div\vec{J}+\frac{\partial\rho}{\partial t}=0$$  $$\int\limits $rot\vec{H}=\vec{J}+\frac{\partial}{\partial t}\vec{D}$  $\rightarrow div(rot\vec{H})=div\vec{J}+\underbrace{div(\frac{\partial}{\partial t}\ve{D})}$  $\rightarrow div\vec{J}=-\frac{\partial}{\partial t}\rho$  $div\vec{J}+\frac{\partial\rho}{\partial t}=0$  $\int\limits  _V div\vec{J}dV=-\frac{dQ}{dt}$$ div\vec{J}dV=-\frac{dQ}{dt}$  \subsection{Grenzbedingung}  $$Div\vec{J}+\frac{\partial\rho $Div\vec{J}+\frac{\partial\rho  _I}{\partial t}=0$$ t}=0$