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Physics - Semiconductors Question with Solution | TestHub

PhysicsSemiconductorsTransistorMedium2 minPYQ_2026

PhysicsMediumsingle choice

In an n-p-n transistor the collector current is $9$ mA. If $90%$ of the electrons from the emitter reach the collector then

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Answer:

Solution:

Given $I_{C} = 9$ mA and $I_{C} = 90%$ of $I_{E}$ .

$I_{C} = 0.9 I_{E}$

$9 = 0.9 I_{E} \Rightarrow I_{E} = 10$ mA

The base current is $I_{B} = I_{E} - I_{C} = 10 - 9 = 1$ mA.

The current gain $β$ is given by $β = \frac{I _{C}}{I _{B}} = \frac{9}{1} = 9.0$ .

Answer: $β = 9.0$

Stream:MHT_CETSubject:PhysicsTopic:SemiconductorsSubtopic:Transistor

⏱ 2mℹ️ Source: PYQ_2026

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