Answer :

Given, rp=8 kΩ, gm=2.5 millimho

a) CASE 1: VP=48 V, Vg= constant


The dynamic resistance of triode is defined as,



where ΔVp is the change in plate voltage and Vg is the grid voltage and ΔIp is the change in plate current


substituting the values




b) CASE 2: gm=2.5 millimho=.0025 mho, Ip =6 mA =.006 A


The mutual inductance gm of a triode valve is defined as





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