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
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?