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Electronic Devices question

2020 · 9 Jan · Shift 1 · Q44
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Electronic Devices question

2020 · 9 Jan · Shift 1 · Q44

JEE MainPhysicsElectronic DevicesNumerical+4 / −1
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 ‾\underline{\hspace{2cm}}​. JEE Main 2020 (Online) 9th January Morning Slot Physics - Semiconductor Question 152 English
Numerical answer
View written solutionFree

Correct answer: 12

The circuit figure is not visible in the prompt, so the exact topology and the shown input voltages are missing. Without the actual circuit diagram, the voltage at point AAA cannot be derived uniquely from first principles.

However, the problem includes the stored correct answer as 121212 V. Since the question asks for comparison with the stored answer as well, I note the following:

  1. For ideal diodes with built-in potential 0.7 V0.7\,\text{V}0.7V, the node voltage in such clipping/selection circuits is usually determined by which diode is forward biased.
  2. But the final numerical value depends completely on:
    • how the diodes are connected,
    • the polarity of each diode,
    • the resistor arrangement,
    • the actual input voltages shown in the missing figure.
  3. Since the figure is absent, a rigorous derivation is not possible from the provided text alone.

Therefore, based only on the stored answer provided with the question, the voltage at point AAA is taken as:

VA=12 VV_A = 12\,\text{V}VA​=12V

So the integer answer is 121212.

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