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The electron mobility in $N$-type germanium is $3900 cm / v - s$ and its conductivity is $6.24 mho / cm$, then impurity concentration will be if the effect of cotters is negligible
Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is $100.$ If the collector current changes by $1\ mA$, what will be the change in emitter current