### How the Gauge Invariance of the Action implies Charge Conservation

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Electrodynamics /
Full Electrodynamics /
Relativistic Electrodynamics

Tags: Gauge Invariance / Charge Conservation / Noether's theorem

Tags: Gauge Invariance / Charge Conservation / Noether's theorem

Usually, gauge transformations are used to simplify certain calculations. In this problem, we want to use them to derive charge conservation from the invariance of the action S.