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# CBSE Class 12-science Answered

A P-N transistor is used in common - emitter mode in an amplifier circuit. A change of 40μA in the base current brings a change of 2mA in collector current and 0.04V in base  -emitter  voltage, Find (i) input resistance (ii) current amplification factor β. If a load resistance of 6 k oh m is used, then find voltage gain?
Asked by Topperlearning User | 10 Jul, 2014, 10:25: AM
Expert Answer

ΔIB = 40μA 40 x 10-6 A

ΔIC = 2mA = 2 x 10-3A

ΔVBE 0.04V

RL = 6kΩ = 6 x 103Ω

(i) Rin =

(ii) β =

voltage - gain = β

Answered by | 10 Jul, 2014, 12:25: PM

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