[UPSC CSE 1986] Semiconductors/Solar cell (Q295, 20M)

A triode has a transconductance (g_m) of 1,600\text{ micromhos}. The following table gives two sets of the plate voltage (E_b), the grid voltage (E_c) and the plate current (I_b). \begin{tabular}{c c c} E_b & E_c & I_b \\ 250\text{ V} & -22\text{ V} & 12.6\text{ mA} \\ 180 & -16.5 & 12.0 \end{tabular} Define the terms amplification factor and plate resistance and calculate them for the above case.