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The change in the carrier density is due to

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The change in the carrier density is due to

(a) Flow of incoming flux

(b) Flow of outgoing flux

(c) Difference of flow between incoming and outgoing flux

(d) Difference of flow between incoming and outgoing flux plus generation and minus recombination

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

My query is from The Continuity Equation topic in portion Conduction in Semiconductors of Electronic Devices & Circuits

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The correct choice is (d) Difference of flow between incoming and outgoing flux plus generation and minus recombination

Explanation: The change in the carrier density describes the continuity equation which is equal to the difference between the incoming and outgoing flux plus generation and minus recombination.

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