Question
Question: With a change of load resistance of a triode, used as an amplifier, from 50 kilo ohms to 100 kilo oh...
With a change of load resistance of a triode, used as an amplifier, from 50 kilo ohms to 100 kilo ohms, its voltage amplification changes from 25 to 30. Plate resistance of the triode is.
A
25 kΩ
B
75 kΩ
C
7.5 kΩ
D
2.5 kΩ
Answer
25 kΩ
Explanation
Solution
Voltage amplification Av=1+RLrpμ
⇒25=1+50×103rpμ ......(i)
And 30=1+100×103rpμ ......(ii)
an solving equation (i) and (ii), rp=25kΩ.