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In the loop figure, the element labeled as the source is 
A$V_3$
B$V_5$
C$V_7$
D$V_s$
Answer & Solution
Correct answer: D. $V_s$
The circular element in the diagram is explicitly labeled as the voltage source $V_s$. The others, $V_1$ through $V_7$, denote potential differences across individual elements.
