1. The problem statement, all variables and given/known data In the diagram, attached to this post, what is the value of Rx in relation to R1 R2 and R3 so that the voltmeter would show 0? 2. Relevant equations Ohm's law and Kirchhoff's laws I suppose. 3. The attempt at a solution I have thought about this thing for too much now, and I have no idea what is going on. My 1st attempt was to use current distribution according to Kirchhoff's current law and see where that takes me, BUT I don't understand how the current flows. Is it ABC, ABDC and ADC, ADBC or does it stay looping ABDA(although I doubt it does)?