The transfer characteristics [output voltage | vedclass

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(B) In the given graph:Region $(I)$ represents the cutoff region,where the transistor is in the $OFF$ state.Region $(II)$ represents the active region

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both in region $I$ and $III$

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(B) In the given graph:Region $(I)$ represents the cutoff region,where the transistor is in the $OFF$ state.Region $(II)$ represents the active region,where the transistor acts as an amplifier.Region $(III)$ represents the saturation region,where the transistor is in the $ON$ state.To use a transistor as a switch,it must be operated between the cutoff region ($OFF$ state) and the saturation region ($ON$ state).Therefore,the transistor is used in both region $(I)$ and region $(III)$ for switching applications.

The transfer characteristics [output voltage $(V_o)$ vs input voltage $(V_i)$] for a base-biased transistor in $CE$ configuration are shown in the figure. For using a transistor as a switch,it is used:

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