Exams › JEE Main › Physics

The Kirchhoff's first law (Σi = 0) and second law (ΣiR = ΣE), where the symbols have their usual meanings, are respectively based on

1. conservation of charge, conservation of momentum
2. conservation of energy, conservation of charge
3. conservation of momentum, conservation of charge
4. conservation of charge, conservation of energy

Correct answer: conservation of charge, conservation of energy

Solution

Kirchhoff's first law is based on the conservation of charge, stating that the total current entering a junction must equal the total current leaving it. The second law is based on the conservation of energy, indicating that the sum of the potential differences in a closed loop must equal the sum of the electromotive forces.

Related JEE Main Physics questions

• A physical quantity X is defined as ε0L(ΔV/Δt), where ε0 denotes the permittivity of free space, L is a length, ΔV is a potential difference, and Δt is a time interval. The dimensional formula of X matches that of which of the following?
• A set of n identical resistors is arranged once in a series combination and once in a parallel combination. What is the ratio of the larger equivalent resistance to the smaller equivalent resistance?
• A resistance coil is connected to a battery. In which arrangement will the maximum heat be produced?
• A bulb is rated at 220 V and 100 W. If the applied voltage falls by 2.5% from its rated value, by what percentage of the rated power will the power output decrease?
• An ammeter has a coil resistance of R. To extend its measuring range by a factor of n, the shunt resistance needed should be:
• How does the drift velocity Vd depend on the strength of the applied electric field?

⚔️ Practice JEE Main Physics free + battle 1v1 →