Conserved Currents in Electromagnetism
The conservation of charge, for example, in the notation of Maxwell's equations,
where:
ρ is the free electric charge density (in units of C/m³)
J is the current density:
- J = v
v is the velocity of the charges.
The equation would apply equally to masses (or other conserved quantities), where the word mass is substituted for the words electric charge above.
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