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What does dn/dx represent?

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in Electronic Devices & Circuits by (272k points)
What does dn/dx represent?

(a) Velocity gradient

(b) Volume gradient

(c) Density gradient

(d) None

This question was addressed to me in an interview for internship.

This intriguing question originated from Diffusion topic in chapter Conduction in Semiconductors of Electronic Devices & Circuits

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The correct option is (c) Density gradient

For explanation: dn/dx represent velocity gradient.

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