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The Kirchhoff's first law (Sigmai = 0) a...

The Kirchhoff's first law `(Sigmai = 0)` and second law `(SigmaiR = SigmaE)`, where the symbols have their usual meanings, are respectively based on

A

conservation of charge, conservation of momentum

B

conservation of energy, conservation of charge

C

conservation of momentum, conservation of charge

D

conservation of charge, conservation of energy

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