Q.
In the circuit shown in the figure, the input voltage Vi is 20 VBE=0 and VCE=0. The values of IB,IC and β are given by
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a
IB=40μA,IC=10 mA,β=250
b
IB=25μA,IC=5 mA,β=200
c
IB=20μA,IC=5 mA,β=250
d
IB=40μA,IC=5 mA,β=125
answer is D.
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Detailed Solution
Given VBE=0VCE=0 ∴Collector current,IC=(20-0)4×103 or IC=5×10-3 A=5 mA Input voltage, Vi=VBE+IBRB or Vi=0+IBRB or 20=IB×500×103∴ IB=20500×103=40μA∴ Current gain, β=ICIB=5×10-340×10-6=125
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