In a triode value for a grid voltage `V_g=-1.2V` , the phase current `I_p` and plate voltage `V_p` are given `I_p=(-5+0.1 V_0),I_p` in `mA and V_p` in volt . When grid voltage is changed to - 3.2 V at constant plate voltage of 150 V , a plate current of 5 mA is observed , then
Voltage amplification for `20 kOmega` load in plate circuit is

Options

A. 5.5
B. 10.5
C. 16.67
D. 20.2

Answer

C

Explanation

Voltage gain `= (muR_L)/(R_p+R_L)`
`= (25xx20xx10^3)/((10xx10^3+20xx10^(3)))=50/3`
i.e, `A_v=16.67`