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In the loop shown in the figure, which element is the voltage source? 
A$V_3$
B$V_5$
C$V_7$
D$V_s$
Answer & Solution
Correct answer: D. $V_s$
The figure explicitly labels the circular source symbol as 'Voltage source ($V_s$)'. The other labels $V_1$ through $V_7$ denote voltage drops or rises across individual circuit elements.
