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  4. In given transistor circuit at saturation mode, VBE=0.8 V,VCE=0.2 V and β =100 , then the required value of RC for which transistor remains in saturation mode, will be:- <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-gneuceeuvyxns926.jpg />

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Q. In given transistor circuit at saturation mode, $V_{BE}=0.8\,V,V_{CE}=0.2\,V$ and $\beta =100$ , then the required value of $R_{C}$ for which transistor remains in saturation mode, will be:-
Question

NTA AbhyasNTA Abhyas 2022

Solution:

Solution
in base emitter loop
$5-\left(200 k\right)i_{B}-0.8=0$
$i_{B}=\frac{5 - 0 . 8}{200 \times 10^{3}}$
$i_{B}=\frac{4 . 2}{2 \times 10^{5}}=2.1\times 10^{- 5}$
$\beta =\frac{i_{C}}{i_{B}}\Rightarrow i_{C}=βi_{B}=100\times 2.1\times 10^{- 5}$
$=2.1\times 10^{- 3}$ Amp.
$V_{CC}-R_{C}i_{c}-0.2=0$
$R_{C}=\frac{V_{CC} - 0 . 2}{i_{C}}=\frac{10 - 0 . 2}{2 . 1 \times 10^{- 3}}=4.67\,k\Omega $