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  4. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/a79572b9cf8f20476a42400622347a4b-.png /> The output characteristics of a typical n-p-n transistor in C E configuration are shown. When VC E=10 V and IC=4.0 mA, then ratio of β AC and β DC is

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The output characteristics of a typical $n-p-n$ transistor in $C E$ configuration are shown. When $V_{C E}=10 V$ and $I_{C}=4.0 \,mA$, then ratio of $\beta_{ AC }$ and $\beta_{ DC }$ is

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

$\because \beta_{ AC }=\left(\frac{\Delta I_{C}}{\Delta I_{B}}\right) V_{C E}$
$\Rightarrow \beta_{ DC }=\frac{I_{C}}{I_{B}}$
Ratio $=\beta_{ AC }: \beta_{ DC }=150: 150=1: 1$