1. The problem statement, all variables and given/known data I have drawn the circuit. I want to calculate the value of R, knowing that i = 50mA ε1 = 2V ε2 = 3V r1 = r2 = 3 ohm 3. The attempt at a solution This is a closed circuit. I imposed the current verse as clockwise. I go through the circuit as the verse of the current from a point "a" to the same point "a". The difference of potential is always zero. ## -ε2 -ir_2 -iR -ir_1 +ε1 = 0 ## I find the R. But it is not the correct answer. What am I doing wrong?