Answer :

The input and output characteristics of n-p-n transistor in CE configuration is given below:




Input resistance is defined as the ratio of change in base-emitter voltage (ΔVBE) to the change in base current (ΔIB) at a constant collector-emitter voltage.



Current amplification factor (β) is defined as the ratio of the change in the collector current to the change in the base current at a constant collector-emitter voltage when the transistor is in active state.



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