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In the loop diagram, if one resistor voltage drop increases while the source voltage remains fixed, what must happen to the sum of the remaining voltage drops for KVL to still hold? 
AIt must increase by the same amount
BIt must decrease by the same amount
CIt must stay unchanged
DIt must become zero
Answer & Solution
Correct answer: B. It must decrease by the same amount
KVL requires the total of all drops to equal the fixed source voltage. If one drop increases and the source is unchanged, the combined total of the remaining drops must decrease by the same amount so that the overall sum remains balanced.