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

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

The estimated current gain from the figure is

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$β = \frac{{ΔΙ}_{C}}{{ΔΙ}_{B}} = \frac{2 \times 10^{- 3}}{10 \times 10^{- 6}}$

$β = \frac{1}{5} \times 10^{3}$

β = 2 × 10²

β = 200