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The Kirchhoff's first law (Σ i=0) and second law (Σ iR=Σ E), where the symbols have their usual meanings, are respectively based on

Asked in JEE Main 2006 · Kirchhoff's laws in networks

• (1) conservation of charge, conservation of energy
• (2) conservation of charge, conservation of momentum
• (3) conservation of energy, conservation of charge
• (4) conservation of momentum, conservation of charge

Step-by-step solution

Why the other options are wrong

• (2) The loop law is energy per unit charge around a closed path, not momentum.
• (3) Swaps the two laws.
• (4) The junction law is about charge, and the loop law about energy, not momentum.

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