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## Homework Statement

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?