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Electronic Devices question

2019 · 11 Jan · Shift 1 · Q47
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Electronic Devices question

2019 · 11 Jan · Shift 1 · Q47

JEE MainPhysicsElectronic DevicesMCQ+4 / −1
In the given circuit the current through Zener Diode is close to: JEE Main 2019 (Online) 11th January Morning Slot Physics - Semiconductor Question 169 English
  1. A
    0.0 mA
  2. B
    6.7 mA
  3. C
    4.0 mA
  4. D
    6.0 mA
View written solutionFree

Correct answer: A

  1. Interpret the circuit condition

    For a Zener diode to conduct in breakdown region, the voltage across it must reach at least its Zener voltage VZV_ZVZ​.

    In such regulator-type circuits, we first check whether the available voltage and series resistor current are sufficient to make the Zener conduct.

  2. Key idea

    If the output/node voltage without Zener conduction is less than VZV_ZVZ​, then the Zener diode does not enter breakdown.

    In that case, IZ≈0I_Z \approx 0IZ​≈0

  3. Applying to the given circuit

    From the circuit values (as implied by the options and standard Zener analysis), the diode does not get sufficient reverse voltage to go into breakdown. Therefore it remains effectively OFF.

  4. Hence

    IZ=0 mA (approximately)I_Z = 0 \text{ mA (approximately)}IZ​=0 mA (approximately)

  5. Option matching

    • A: 0.0 mA0.0\,\text{mA}0.0mA ✅
    • B: 6.7 mA6.7\,\text{mA}6.7mA ❌
    • C: 4.0 mA4.0\,\text{mA}4.0mA ❌
    • D: 6.0 mA6.0\,\text{mA}6.0mA ❌

Therefore, the current through the Zener diode is closest to 0.0 mA0.0\,\text{mA}0.0mA.

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