Find the values of `r_p, mu and g_m` of a triode operating at plate voltage `200 V` and grid voltage `-6 V`. The plate characteristic are shown in figure.

Explanation

We have `r_p = (omegaV_p/omegaI_p) constant at V_g `
` Consider the two points on V_g = -6 line `
` r_p = ((240-160)V/((13-3) xx (10^-3)A))`
` = 80/10 xx (10^3)Omega `
` = 8K Omega `
g_m = (omegaI_p/omegaV_0) = constant `
Considering the points on 200 V line,
` g_m = (((13-3) xx (10^-3))/[(-4) + (-8)])A `
` = ((10 xx (10^-3))/4)`
` = 2.5 mili mho `
` mu = r_p xx g_m `
` = 8 xx (10^3) Omega xx 2.5 xx (10^-3) Omega ^-1`
` = 8 xx 2.5 = 20 ` .