This ckt comes as a question in our previous year exam. what will be current " I " and voltage drop " Vo " . Generally voltage drop across any diode around 0.7 V (which is used for other problems).
If I guess initially \$ V_o \$ is zero then D1 become ON and voltage at \$ V_o \$ become 3-0.7 = 2.3V , which cause D3 to be ON . If D3 is ON then voltage at \$ V_o \$ should become 1+0.7=1.7V. So there is no way that diode voltage drop remain at 0.7V .
How could I solve this kind of problem? How could I decide which will be the voltage drop across the diode in this kind of situation?
It'll be very helpful If someone explain it also. Thnx in advance .