A`p-n-p` transistor is used in common-emitter mode in an amplifier circuuit. A change of `40muA` in the base current brings a change of `2mA` in collector current and `0.04V` in base-emitter volatage. Find the (a) input resistance `r_(i)` and (b) the base current amplification factor `(beta)`. (c ) if a load of `6kOmega` is used, then also find the voltage gain of the amplifier.A. `1000 Omega, 50`B. `2000 Omega, 40`C. `5000 Omega, 20`D. none of these

A`p-n-p` transistor is used in common-emitter mode in an amplifier cir

1.	A`p-n-p` transistor is used in common-emitter mode in an amplifier circuuit. A change of `40muA` in the base current brings a change of `2mA` in collector current and `0.04V` in base-emitter volatage. Find the (a) input resistance `r_(i)` and (b) the base current amplification factor `(beta)`. (c ) if a load of `6kOmega` is used, then also find the voltage gain of the amplifier.A. `1000 Omega, 50`B. `2000 Omega, 40`C. `5000 Omega, 20`D. none of these
Answer» Correct Answer - A `R_(i)=(V_("be"))/(I_(b))` `=(0.04)/(40xx10^(-6))=1000 Omega` `beta=(I_(c))/(I_(b))=(2xx10^(-3))/(40xx10^(-6))=50`

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