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Question

Kirchhoff’s junction law is a consequence of which of the following law(s)?

A
Conservation of momentum
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B
Conservation of charge
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C
Conservation of energy
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D
Conservation of mass
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Solution

The correct option is B Conservation of charge
Because charges are always conserved, the amount of charge flowing into a junction must come out, i.e. there should not be any charges stored at the junction. Hence Kirchhoff's junction law is a consequence of the law of conservation of electric charge.

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