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JEE Main 2021 (18 Mar, Shift 2) · Junction Transistor

Junction Transistor question from JEE Main 2021 (18 Mar, Shift 2)

Q73JEE Main 2021 · 18 MAR · SHIFT 2Medium

Junction Transistor

The typical output characteristics curve for a transistor working in the common-emitter configuration is shown in the figure.

Figure

The estimated current gain from the figure is __________.

Numerical answer type. Work it out, then open the answer.

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Answer: 200

  1. Current gain from output characteristics: β=ΔICΔIB\beta = \dfrac{\Delta I_C}{\Delta I_B} at constant VCEV_{CE}.
  2. Adjacent curves: ΔIB=10 μA\Delta I_B = 10\ \mu\text{A} gives ΔIC=2 mA\Delta I_C = 2\ \text{mA}.
  3. β=2×10−310×10−6=200\beta = \dfrac{2 \times 10^{-3}}{10 \times 10^{-6}} = 200
  4. So the current gain is 200.
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