Before the saturation state of a diode at the plate voltages of $400 V$ and $200 V$ respectively the currents are $i$ and $i$ respectively. The ratio $i / i$ will be
A$\sqrt{2} / 4$
B$2 \sqrt{2}$
C$2$
D$1 / 2$
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C$2$
Before saturation region, linear region comes. In linear region.
$ i_p \propto V_p \Rightarrow \frac{i_1}{i_2}=\frac{V_{p_1}}{V_{p_2}}=\frac{400}{200}=\frac{2}{1} .$
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Plate voltage of a triode is increased from $200 V$ to $225 V$. To maintain the plate current, change in grid voltage from $5 V$ to $5.75 V$ is needed. The amplification factor is