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In a silicon transistor, base current is...

In a silicon transistor, base current is changed by `20muA`. This result in a change of `0.02V` in base-emitter voltage and a change of `2 mA` in the collector current.
Find the input resistance, `beta_(a.c.)` and transconductance of the transistor.
The transistor is used as an amplifier with the load resistance `5k Omega`. What is the voltage gain of the amplifier?

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