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Q.

A transistor is used in a common-emitter mode in an amplifier circuit. When a signal of 20 mV is added to the base-emitter voltage, the base current changes by 20 µA and the collector current changes by 2 mA.  The load resistor  in 5 kΩ.  What is the value of β?

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a

10

b

100

c

1000

d

106

answer is B.

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Detailed Solution

β=ΔIcΔIb=2mA20μA=2×10−320×10−6=100
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