1. The problem statement, all variables and given/known data 2. Relevant equations Ohm's Law (V=IR) 3. The attempt at a solution These are my two attempts at getting to the solution. I'm really finding it difficult to tackle this question (our teacher gave it as an optional challenge). The provided answer on the worksheet is ɛ/2, but I have no clue how to get there. Any help is much appreciated.