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Current gain of a transistor from changes in collector and base (or emitter) current

This type of question, asked 3 times: 2021 Paper 1, 27 Jul 2022, 12 Apr 2023. All 3 questions below, oldest first.

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  1. Question 1

    2021 Paper 1

    16
    If an emitter current is changed by 4 mA4\text{ }mA, the collector current changes by 3.5 mA3.5\text{ }mA. The value of β\beta will be -

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  2. Question 2

    27 Jul 2022

    109
    For a constant collector-emitter voltage of 8 V8\text{ }V, the collector current of a transistor reached to the value of 6 mA6\text{ }mA from 4 mA4\text{ }mA, whereas base current changed from 20μA20\mu A to 25μA25\mu A value. If transistor is in active state, small signal current gain (current amplification factor) will be:

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  3. Question 3

    12 Apr 2023

    4
    In an n−p−nn - p - n common emitter (CE) transistor the collector current changes from 5 mA5\text{ }mA to 16 mA16\text{ }mA for the change in base current from 100μA100\mu A and 200μA200\mu A, respectively. The current gain of transistor is____

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