Learn

Saturday, 31 October

JEE Main 2020 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 9 January 2020, Shift 1, Physics Q25

Question 25 of 75 in this shift, Physics question 25 of 25, Section B.

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 __________.

The figure, in words

Circuit with a top wire and a bottom wire. Top wire: a dot at the far left, a diode (triangle pointing right, bar on its right side), a junction labelled A, then a second diode (triangle pointing left, bar on its left side), then a dot at the far right. A resistor (zigzag) hangs vertically from A down to the bottom wire, which has a dot at each end. Label V_in = 12.7 V at the left, between the top and bottom wires; label 4 V at the right.

Official answer

12.00

NTA final key (Jan 2020).

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Ideal vs. Practical Diode Circuit Analysis

Same idea in other shifts

Asked 12× in all
  1. 4 Apr 2026, Shift 1 · Q42Consider a circuit consisting of a capacitor (20 μ20\ \muF), resistor (100 Ω100\ \Omega) and two identical diodes as shown in figure. The…MediumDiagram basedHas a figure
  2. 8 Apr 2025, Shift 2 · Q45The output voltage in the following circuit is (Consider ideal diode case)MediumDiagram basedHas a figure
  3. 4 Apr 2024, Shift 1 · Q48The value of net resistance of the network as shown in the given figure is :MediumDiagram basedHas a figure
  4. 15 Apr 2023, Shift 1 · Q43In the given circuit, the current (I) through the battery will beMediumDiagram basedHas a figure
  5. 25 Jul 2022, Shift 2 · Q56Two ideal diodes are connected in the network as shown is figure. The equivalent resistance between A and B is _______ Ω\Omega .MediumNumerical valueHas a figure
  6. 27 Jun 2022, Shift 2 · Q60The cut-off voltage of the diodes (shown in figure) in forward bias is 0.6 V. The current through the resister of 40 Ω\Omega is ________…MediumNumerical valueHas a figure
  7. 27 Aug 2021, Shift 1 · Q21A circuit is arranged as shown in figure. The output voltage Vo\mathrm{V_o} is equal to __________ V.MediumNumerical valueHas a figure
  8. 25 Feb 2021, Shift 1 · Q7A 5 V battery is connected across the points X and Y. Assume D1D_1 and D2D_2 to be normal silicon diodes. Find the current supplied by the…MediumDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.