Define displacement vector 
and deduce Gauss’s law in a dielectric medium.
In Electromagnetic Theory, the displacement vector (or electric displacement field), denoted as D, is a vector field that represents the effect of free and bound charge distributions in a dielectric medium. It is related to the electric field E __________ _____ ___ _________ __________ _____ ___ ______ _______ _________ __________ ______.
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Define displacement vector and deduce Gauss’s law in a dielectric medium.
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