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(A) The current gain $\beta$ of a common-emitter transistor is defined as the ratio of the change in collector current to the change in base current a

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$20$

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(A) The current gain $\beta$ of a common-emitter transistor is defined as the ratio of the change in collector current to the change in base current at a constant collector-emitter voltage.Given:Change in base current $\Delta I_b = 50 \mu A = 50 	imes 10^{-6} \ A$Change in collector current $\Delta I_c = 1 \ mA = 1 	imes 10^{-3} \ A$The formula for current gain is $\beta = \frac{\Delta I_c}{\Delta I_b}$.Substituting the values:$\beta = \frac{1 	imes 10^{-3}}{50 	imes 10^{-6}} = \frac{1000}{50} = 20$.Therefore,the current gain of the transistor is $20$.

In a transistor circuit,when the base current is increased by $50 \mu A$ keeping the collector voltage fixed at $2 \ V$,the collector current increases by $1 \ mA$. The current gain of the transistor is

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