The input resistance of a silicon transistor is `100Omega` base current is changed by `40muA` which results in a change in collector current by `2mA`. This transistor is used as a common emitter amplifier with a load resistance of `4kOmega`. The voltage gain of the amplifier is

Options

A. 2000
B. 3000
C. 4000
D. 1000

Answer

A

Explanation

Voltage gain `=(V_(out))/(V_("in"))=(I_(out))/(I_("in"))xx(R_(out))/(R_("in"))`
`=(2xx10^(-3))/(40xx10^(-6))xx(4xx10^(3))/(100)=2xx1000=2000`