Reason (R): If the sum of "Potential Differences" around a closed loop is not zero, unlimited energy could be gained by repeatedly carrying a charge around a loop.
Solution:
Kirchhoff's loop law states that the algebraic sum of changes in potential around any closed loop is zero, which is a direct consequence of the conservation of energy. If this sum were not zero, it would imply energy creation or destruction, violating energy conservation. Thus, both (A) and (R) are true, and (R) correctly explains (A).
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