I am asked to find the current through the second diode, as shown in the image below.
I have gone through my procedure to find this current, and can not figure out why my answer is wrong.
What I did is as follows:
I assumed that both diodes were conducting. I then checked this assumption by seeing if the current through diode 1 and diode 2 is greater than zero.
current through diode 1 = (12 - 0.7 - (-0.7) - 4) / 4000 = 2mA (which is greater than 0)
current through the second resistor = (4 - 0.7)/ (1.3 x 10^3) = 2.538 x 10^-3 A
And by KCL, current through diode 2 = 5.38 x 10^-4, which is greater than zero.
I appreciate your help and time,
thank you very much.