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Which of the following results when the equilibrium established in a semiconductor?

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Which of the following results when the equilibrium established in a semiconductor?

(a) Restrain the process of diffusion

(b) Electric field becomes very high

(c) Both a and b

(d) None of these

I had been asked this question during an internship interview.

My doubt is from Qualitative Theory of the p-n junction in chapter Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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Correct choice is (c) Both a and b

Explanation: As the electric field is very high, the flow of the carries will be restricted and the equilibrium will be obtained.

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