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In the loop shown, which element is the voltage source $V_s$? 
AThe left vertical element labeled $V_2$
BThe lower left circular source symbol
CThe top horizontal element labeled $V_3$
DThe bottom horizontal element labeled $V_7$
Answer & Solution
Correct answer: B. The lower left circular source symbol
The figure labels the circular element at the lower left as the voltage source $V_s$. The rectangular elements correspond to voltage drops $V_1$ to $V_7$.
