In the cuircuit shown here the transistor used has a current gain `beta=100`. What should be the bias resistor `R_(BE)` so that `V_(CE)=5V("neglect "V_(BE))`

Options

A. `200 xx 10^3 Omega`
B. `1xx10^6 Omega`
C. `500 Omega`
D. `2 xx 10^3 Omega`

Answer

A

Explanation

Applying Kirchhoff's law to mesh ADCEFA
`V_("CC")=10=I_Cxx10^3+V_(CE)`
`10=I_Cxx10^3+5`
`I_C=5xx10^(-3)A`…(i)
Applying Kirchhoff's law of mesh AGBEFA
`I_BxxR_B+V_(BE)=V_("CC")=10V`
`I_BxxR_B+0=10`…(ii)
`5xx10^(-5)xxR_B=10`
`R_B=2xx10^5 Omega`
`=200xx10^3 Omega`