A junction J is connected to four metallic leads

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Electric Circuits · Electric Circuits

Problem

A junction J is connected to four metallic leads. Currents of

4.0\,\text{A}

and

2.5\,\text{A}

flow towards the junction through two of the leads, while a current of

1.8\,\text{A}

flows away from the junction through the third lead. Assuming the current in the fourth lead to be

I

, find: (i) the magnitude of

I

, and (ii) whether it flows into or out of the junction.