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Electrostatics is concerned with the electrical fields and scalar potentials of stationary electrical charges and charge distributions. Use this for questions about electromagnetic situations in which currents and magnetic fields are absent, otherwise use the [electromagnetism] and/or [magnetic-fields] tags.
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Electrostatics and field lines
Ok, what we usually tell is electric field originates from a positive charge and ends on a negative charge. This time you placed a positive charge and there is no negative charge anywhere and now you …
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Gauss' law in matter and the macroscopic electric field
If you apply an electric field E' on a material. Then polarisation happens inside that material. This polarisation will create a new electric field that will be equal to the field caused by $\rho_b \, …