While analysing a circuit, a student assumed that the branch current I3 enters a junction. After solving the equations, she obtained I3=−2A. What does the negative sign indicate?
a) The current still enters the junction with magnitude 2A because current is always taken positive.
b) The current actually leaves the junction with magnitude 2A.
c) Kirchhoff’s current law is violated at that junction because of the negative result.
d) The sign only refers to electron flow; a conventional current of 2A still enters the junction.