1. The problem statement, all variables and given/known data http://img3.imageshack.us/img3/3939/opamp.jpg [Broken] Draw an imaginary boundary around the op-amp, and apply KCL at the five wires that intersect the boundary 2. Relevant equations 3. The attempt at a solution I am having quite a problem understanding the question above... which boundary should I draw around? Could someone point this out?