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Question

# A signal of 20 mV is applied to common emitter transistor amplifier circuit. Due to this, the change in base current and the change in collector current are 20 μA and 2 μA respectively. The load resistance is 10 kΩ. The voltage gain is,

A
1000
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B
100
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C
10
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D
0.01
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Solution

## The correct option is A 1000Given: Input signal, VBE=20 mV=20×10−3 V Change in base current, ΔIB=20 μA=20×10−6 A Change in collector current, ΔIC=2 mA=2×10−3A Load/ output resistance, ro=10 kΩ=10×103 Ω So, ro=ΔVCEΔIC⇒10×103=ΔVCE2×10−3 ⇒ΔVCE=20 V Further, voltage gain, AV=VoVi=VCEVBE=2020×10−3=1000 Hence, (A) is the correct answer. Why this question?Caution: Some of the data are given in extra to confuse you. All the data given may or may not be used.

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