In the circuit branch below, with current and node definitions as shown, the black (negative) lead of an ideal voltmeter is attached to node "A" and the red (positive) lead is attached to node "B". If the voltmeter reads ?5V, what is the value for I, given the current direction shown in the diagram, if R=1k??
A. 5 A
B. ?5 mA
C. 5 mA
D. ?5 kA
E. ?5 A
Answer: C
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