The law of conservation of charge states that charges can neither be created nor destroyed
in a given volume. Hence, if the positive charge that flows into a volume at any instant t
exceeds the positive charge that flows out of the volume at the same instant, then, the net
charge stored inside the volume must be increasing at that instant. Similarly, if the positive
charge that flows out of the volume exceeds the positive charge that flows into the volume
at that instant, then, the net charge stored within must be decreasing at that instant.
Therefore, the net positive current that flows into the volume at an instant ...
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