A) 15 V
B) 8 V
C) 25 V
D) 12 V.
Correct Answer: A
Solution :
To reduce the plate current to zero \[{{V}_{P}}\] should be reduced to zero. Hence for \[{{I}_{P}}=0.\]. \[\Delta {{V}_{P}}=0-300\] \[=-300V\] We know that amplification factor, \[\mu ={{\left( \frac{\Delta {{V}_{P}}}{\Delta {{V}_{G}}} \right)}_{\Delta {{I}_{P}}=cons\tan t}}\] \[\therefore \] \[\Delta {{V}_{G}}=\frac{\Delta {{V}_{P}}}{\mu }\] \[=-\frac{300}{20}\] \[=-15\] \[\therefore \]Required Grid voltage is - 15 V.
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