Currents and enter a node N from two different branches

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

Problem

Currents

I_1=5\,\text{A}

and

I_2=3\,\text{A}

enter a node N from two different branches. A current of

4\,\text{A}

leaves the node through one branch. If current

I_3

is assumed to leave the node through the remaining branch, the value of

I_3

is (a)

8\,\text{A}

leaving the node (b)

-4\,\text{A}

(i.e.

4\,\text{A}

entering the node) (c)

4\,\text{A}

leaving the node (d)

12\,\text{A}

leaving the node