MHT CET 2024 Physics question

Not in JEE Advanced syllabus

If the p-n junction diode is unbiased ,

(A)n-type side has lower potential than p-type side
(B)n-type side has same potential as p-type side
(C)An electric field is established at the junction such that n side is at positive voltage relative to p-sideCorrect
(D)The potential across the junction is such that p-side is at positive voltage relative to n-side

Answer: (C)

Solution

When a p-n junction is formed, electrons diffuse from the n-side to the p-side and holes from the p-side to the n-side. This leaves immobile positive donor ions on the n-side and negative acceptor ions on the p-side, creating a depletion region with an internal electric field directed from n to p.

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Question ID VK-099798