For a CE transistor amplifier, the audio signal across the collector resistance of `2kOmega` is 2V. Suppose the current amplification factor of the transistor is 100, find the input signal voltage and base current, if the base resistance is 1 k`Omega`.

Options

A. `5 muA`
B. `10 muA`
C. `15 muA`
D. `20 muA`

Answer

B

Explanation

Here , `R_0 = 2kOmega = 2000 Omega , a = 100 , R_i= 1kOmega = 1000 Omega , V_0 = 2V`
`:.` voltage amplification factor `A_v=V_o/V_i=alpha(R_o)/(R_i)`
`:. V_t=(V_oR_i)/(alphaR_o)=(2xx1000)/(100xx2000)=0.01V`
Also , `I_b=V_i/R_i=(0.01)/(1000)=1xx10^(-5)xx10^(6)muA`
`= 10 muA`.