Answer :

(i) Input resistance may be defined as the ratio of small change in the base – emitter voltage() to the resulting change in the base current ( at constant collector- emitter voltage(

Input resistance =

To find the input resistance mark a point P on the characteristics. Now, draw a tangent at point P. The reciprocal of slope of AB will give the input resistance.

(ii) Currant amplification factor r=is defined as the ratio of the change in collector current () to the change in base current ().

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