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Kirchhoff's loop rule states that the algebraic sum of changes in potential around any closed loop is zero. This rule is a consequence of
Aconservation of charge at junctions
Bthe electric potential being a unique function of position
Cthe resistivity being independent of temperature
Dthe drift velocity being constant
Answer & Solution
Correct answer: B. the electric potential being a unique function of position
1. Electric potential has a definite value at each point in the circuit.
2. Going around a closed loop returns to the starting point.
3. The net change in a single-valued potential over a closed path must be zero.
4. So B; conservation of charge underlies the junction rule (A), not the loop rule.
_Source: NCERT Class 12 Physics Ch 3 "Current Electricity", p.17_
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