Which of the following statements is true for an N-type semiconductor
A
The donor level lies closely below the bottom of the conduction band
B
The donor level lies closely above the top of the valence band
C
The donor level lies at the halfway mark of the forbidden energy gap
D
None of above
[CPMT 2004]
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A
The donor level lies closely below the bottom of the conduction band
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The current in a triode at anode potential $100\ V$ and grid potential $1.2 \ V$ is $7.5\ mA$. If grid potential is changed to $-2.2\ V$, the current becomes $5.5\ mA$. the value of trans conductance $(g)$ will be