The conservation equation - opracowanie

The conservation equation The equation expressing the fact that charge cannot be created or destroyed, but can
merely be moved around in the form of an electric current, which if of suitable nonuniformity
in space might cause a change of charge density to arise, is in integral form
∂
∂t
Z
v
ρdv = −
I
S J · ds (4.1)
or in differential form
∂ρ
∂t
= −∇ · J
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