At a junction

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Circuits · Electric Circuits

Problem

At a junction, three of the four branch currents are known:

1.5\,\text{A}

enters,

0.40\,\text{A}

enters, and

0.60\,\text{A}

leaves. What are the magnitude and direction of the fourth branch current

I_4

? (a)

0.50\,\text{A}

entering the junction (b)

1.3\,\text{A}

entering the junction (c)

1.3\,\text{A}

leaving the junction (d)

0.90\,\text{A}

leaving the junction