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Which is the correct formula for the Jp?

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Which is the correct formula for the Jp?

(a) Jp=qDdp/dx

(b) Jp=pDdn/dx

(c) Jp=-qDdp/dx

(d) None

I have been asked this question in a national level competition.

This is a very interesting question from Diffusion in chapter Conduction in Semiconductors of Electronic Devices & Circuits

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Correct answer is (c) Jp=-qDdp/dx

For explanation: Jp is negative for the p type of semiconductors.

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