Question

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

• A. Conservation of momentum
• B. Conservation of charge
• C. Conservation of energy
• D. Conservation of mass

Answer 1

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.