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Transfer characteristics [output voltage $\left(V_{0}\right)$ vs input voltage $\left.\left(V_{\mathrm{i}}\right)\right]$ for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used

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both in region (I) and (III)
$\mathrm{I} \rightarrow \mathrm{ON}$
$\mathrm{II} \rightarrow \mathrm{OFF}$
In II nd state it is used as a amplifier it is active region.
$\mathrm{II} \rightarrow \mathrm{OFF}$
In II nd state it is used as a amplifier it is active region.
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