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Definition of Electrostatic Field In electrostatics, we ask \vec{E} to be independent of time, but it can change with position. \nabla\cdot\vec{E}=\frac{\rho}{\varepsilon_{0}} We also ask \vec{B} to be independent of time. \nabla\times\vec{E}=-\frac{\partial\vec{B}}{\partial t}=0 - This equation is used to decide whether an electric field can be an el
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