Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is 0.7 V. For the input voltages shown in the figure, the voltage (in Volts) at point A is ____.
Answer: 12
Solution
The left diode has its anode held at 12.7 V and the right diode has its cathode held at 5 V, with point A between them. The left diode conducts once VA<12.7−0.7=12 V, and the right conducts once VA>5+0.7=5.7 V. Because the higher source sits on the left, the left diode turns on and clamps the point while the right diode stays reverse biased. The voltage at A is therefore 12.7−0.7=12 V.
JEE Main · 2020 · 09 Jan 2020 · Shift 1 · Integer answer
