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  4. For the transistor circuit shown in figure, if β =100, voltage drop across emitter and base is 0.7 V, then the value of VCE will be

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Q. For the transistor circuit shown in figure, if $\beta =100,$ voltage drop across emitter and base is $0.7\, V,$ then the value of $V_{CE}$ will bePhysics Question Image

Bihar CECEBihar CECE 2012Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

We have, $i_{b} =\frac{5-0.7}{8.6}=0.5\, mA$
$\therefore i_{c} =\beta_{i b}=100 \times 0.5\, mA$
$=50\, mA$
By using
$V_{C E} =V_{C C}-i_{C} R_{L}$
$=18-50 \times 10^{-3} \times 100$
$=18-5=13\, V$