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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 30 June 2022, Shift 1, Physics Q60

Question 60 of 90 in this shift, Physics question 30 of 30, Section B.

The circuit diagram used to study the characteristic curve of a zener diode is connected to variable power supply (0−15 V) as shown in figure. A zener diode with maximum potential Vz\mathrm{V_z}=10 V and maximum power dissipation of 0.4 W is connected across a potential divider arrangement. The value of resistance Rp\mathrm{R_p} connected in series with the zener diode to protect it from the damage is __________ Ω\Omega.

The figure, in words

Circuit: a resistor Rp in series with a zener diode, with a voltmeter Vz (marked + and −) connected across the diode; current Iz marked by an arrow; a microammeter (µA, marked + and −) on the right branch; a rheostat Rh used as a potential divider; a variable supply E with a key at the bottom.

Official answer

125

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Zener Diode Power Dissipation Limits

Same idea in other shifts

Asked 5× in all
  1. 4 Apr 2026, Shift 2 · Q46A diode has Zener voltage of 10 V and maximum power dissipation of 0.5 W, then the minimum resistance to be used in series with this diode…MediumNumerical value
  2. 1 Feb 2024, Shift 1 · Q48In the given circuit if the power rating of Zener diode is 10 mW, the value of series resistance RsR_s to regulate the input unregulated…MediumSingle correctHas a figure
  3. 10 Apr 2023, Shift 1 · Q43A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V and it has to regulate…MediumDiagram basedHas a figure
  4. 27 Aug 2021, Shift 2 · Q30A zener diode of power rating 2 W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V and it has to regulate…MediumNumerical valueHas 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.