Kirchhoff's loop rule is based on-
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Law of conservation of energy
The loop rule says that the algebraic sum of the potential changes round any closed loop is zero. A unit charge taken round a closed loop returns to its starting potential, so the energy it gains from cells equals the energy it loses in resistors. The rule is therefore a statement of the conservation of energy.
\( \displaystyle \sum \Delta V = 0 \)
Why the other options are incorrect
Option (2) Law of conservation of mass — Incorrect. Mass plays no part in either of Kirchhoff’s rules.
Option (3) Law of conservation of momentum — Incorrect. Momentum plays no part in either of Kirchhoff’s rules.
Option (4) Law of conservation of electric charge — Incorrect. Conservation of charge is the basis of the junction rule (the sum of currents entering a junction equals the sum leaving), not the loop rule.
Note: A similar question was also asked in CUET (UG) 2025 on 02-06-2025 (Slot 1).