Ramberg, Edward G. RCA Laboratories, Princeton, New Jersey.
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The net electric charge within a given volume. If both positive and negative charges are present, the space charge represents the excess of the total positive charge diffused through the volume in question over the total negative charge. Since electric field lines end on electric charge, the space-charge density ρ may also be defined in terms of the divergence of the electric field E or the laplacian of the electric potential V by Eq. (1)
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