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Q: Does an electric field have mass? Does it take energy to move an electric field?
The original question was: An electric field stores energy. It has an electric field. PS I appreciate it will be incredibly small and I also appreciate there may also be a magnetic field due to the changing electric field. The electric field has mass (or, at the very least you could say that it has inertia and attracts things gravitationally), because it carries energy. The energy density, K, of the electric field around a charge, q, is (ignoring all the physical constants for simplicity).
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