Wire A carries 4 A into a junction,wire B carries 5 A into the same junction,and another wire is connected to the junction.What is the current in this last wire?
A) 4 A away from the junction
B) 9 A away from the junction
C) 4 A into the junction
D) 9 A into the junction
E) 1 A away from the junction

Question

Quizplus · Accepted Answer

The total current entering the junction is 4 A + 5 A = 9 A. By the conservation of charge, the same amount of current must leave the junction, so the current in the last wire is 9 A away from the junction.

Wire a Carries 4 a into a Junction,wire B Carries