| \[{{V}_{g}}\](volt) | 0 | ? 2 | ? 4 | ? 6 |
| \[{{I}_{p}}(mA)\] for \[{{V}_{p}}=150\] volts | 15 | 12.5 | 10 | 7.5 |
| \[{{I}_{p}}(mA)\] for \[{{V}_{p}}=120\] volts | 10 | 7.5 | 5 | 2.5 |
A) 2000 ohms
B) 4000 ohms
C) 8000 ohms
D) 6000 ohms
Correct Answer: D
Solution :
\[{{g}_{m}}={{\left( \frac{\Delta {{i}_{p}}}{\Delta {{V}_{g}}} \right)}_{{{V}_{p}}=\,\text{constant}}}=\frac{(15-10)\times {{10}^{-\,3}}}{0\,-\,(-\,4)}=1.25\times {{10}^{-3}}\Omega \] \[\mu ={{\left( \frac{\Delta {{V}_{p}}}{\Delta {{V}_{g}}} \right)}_{{{I}_{p}}=\,\text{constant}}}=\frac{150-120}{0-\,\,(-\,4)}=7.5\] \ \[{{r}_{p}}=\frac{\mu }{{{g}_{m}}}=\frac{7.5}{1.25\times {{10}^{-3}}}=6000\]ohms
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