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A fundamental property of matter which causes it to experience electromagnetic forces.

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charge density is a constant or a scalar-value function of position?

Since it is "density", I suppose that such values as charge density of a volume region $\rho_v$, charge density of a line $\rho_L$, and charge density of a surface $\rho_S$ is a constant but I sometimes … that charge density is a scalar field. …
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