In an NPN transistor circuit, the collector current is $10 mA$. If $90 \%$ of the electrons emitted reach the collector, the emitter current ( $i$ ) and base current $(i)$ are given by
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Which is the wrong statement in following sentences? A device in which $P$ and $N$-type semiconductors are used is more useful then a vacuum type because
A semiconductor $X$ is made by doping a germanium crystal with arsenic $(Z=33)$. A second semiconductor $Y$ is made by doping germanium with indium $(Z=49)$. The two are joined end to end and connected to a battery as shown. Which of the following statements is correct