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On which of the following does the scale current not depends upon?

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On which of the following does the scale current not depends upon?

(a) Effective width of the base

(b) Charge of an electron

(c) Electron diffusivity

(d) Volume of the base-emitter junction

I have been asked this question by my school principal while I was bunking the class.

The query is from BJTs Device Strucutres and Physical Operations in division Bipolar Junction Triodes (BJTs) of Electronic Devices & Circuits

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Correct choice is (d) Volume of the base-emitter junction

For explanation: The saturation current does not depends upon the volume of the base-emitter junction. Instead it depends upon the area of the cross section of the base-emitter junction in a direction perpendicular to the flow of current.

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