Physics

Problem

At a junction J, currents of

I_1 = 2.5\,\text{A}

and

I_2 = 1.3\,\text{A}

flow into the node, while a current of

I_3 = 0.8\,\text{A}

flows out. Calculate the magnitude and direction (into or out of the node) of the fourth current

I_4