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In a transistor when base-emitter voltag...

In a transistor when base-emitter voltage is changed from `0.6 V` to `0.8 V`, the change in base current is `500 muA` to the change in collector current is `10 mA` to `40 mA`, when the collector-emitter voltage is kept constant at `2 V`. Find input impendance forward current ratio:

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