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

Options

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

Explanation

To solve the question regarding Kirchhoff's laws, we need to understand the fundamental principles behind each law.

### Step-by-Step Solution:

1. **Understanding Kirchhoff's First Law**:
- Kirchhoff's first law states that the sum of currents entering a junction must equal the sum of currents leaving the junction. Mathematically, this is represented as \( \Sigma I = 0 \).
- This law is based on the **conservation of charge**. It implies that charge cannot accumulate at a junction; whatever charge flows into the junction must flow out.

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