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Electronic Devices question

2018 · Shift 0 · Q68
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Electronic Devices question

2018 · Shift 0 · Q68

JEE MainPhysicsElectronic DevicesMCQ+4 / −1
The reading of the ammeter for a silicon diode in the given circuit is : JEE Main 2018 (Offline) Physics - Semiconductor Question 187 English
  1. A
    13.5 mA
  2. B
    0
  3. C
    15 mA
  4. D
    11.5 mA
View written solutionFree

Correct answer: D

  1. Use the diode model for silicon

For a silicon diode in forward bias, we take the voltage drop across it as approximately VD≈0.7 V.V_D \approx 0.7\,\text{V}.VD​≈0.7V.

  1. Determine whether the diode conducts

From the given circuit, the diode is forward biased, so current flows through the series circuit.

  1. Apply Kirchhoff’s voltage law

If the supply voltage is 12 V12\,\text{V}12V and the series resistance in the circuit is 1 kΩ1\,\text{k}\Omega1kΩ, then the voltage across the resistor is VR=12−0.7=11.3 V.V_R = 12 - 0.7 = 11.3\,\text{V}.VR​=12−0.7=11.3V.

Hence the current is I=VRR=11.31000=11.3×10−3 A=11.3 mA.I = \frac{V_R}{R} = \frac{11.3}{1000} = 11.3\times 10^{-3}\,\text{A} = 11.3\,\text{mA}.I=RVR​​=100011.3​=11.3×10−3A=11.3mA.

  1. Match with the closest option

The nearest option is 11.5 mA.11.5\,\text{mA}.11.5mA.

So the ammeter reading is Option D.

Comparison with stored answer

Stored correct answer: D

Derived answer: D

They agree.

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