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The output characteristics of a transistor is shown in the figure. When $V_{CE}$ is 10 V and $I_C = 4.0$ mA, then value of $\beta_{ac}$ is ______.
$\Delta I_B = (30 - 20) = 10\ \mu$A, $\Delta I_C = (4.5 - 3) = 1.5$ mA. $\beta = 1.5\ \text{mA}/10\ \mu\text{A} = 150$.
BETA
