Which impurity is doped in $S i$ to form $N$-type semi-conductor?
A$Al$
B$B$
C$A s$
D
None of these
[CBSE PMT 1996; AIEEE 2002]
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C$A s$
Because As is pentavalent impurity.
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The plate resistance of a triode is $2.5 \times 10^4 \Omega$ and mutual conductance is $2 \times 10^{-3} mho$. What will be the value of amplification factor
The figure represents variation of triode parameter ( $\mu$ or $r$ or $g$ ) with the plate current. The correct variation of $\mu$ and $r$ are given, respectively by the curves