Current Electricity Charging Discharging Of Capacitors Question 719
Question: The four wires from a larger circuit intersect at junction A as shown. What is the magnitude and direction of the current between points A and B?
Options:
A) 2A from A to B
B) 2A from B to A
C) 3A from A to B
D) 2A from B to A
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Kirchhoff’s junction rule states that the algebraic sum of all currents into and out of any branch point is zero: $ \sum I=0 $ By convention, the sign of current entering a junction is positive and current leaving a junction is negative. $ 4A+5A-6A+I _{AB}=0, $
Therefore $ I _{AB}=-3A. $ The wire between points A and B carries a current of 3A away from the junction.
BETA
