MHT CET 2025 Physics question

Not in JEE Advanced syllabus

In unbiased p-n junction diode

(A)the potential is same everywhere
(B)there is an electric field at the junction directed from the p-type side to the n-type side
(C)there is an electric field at the junction directed from the n-type side to p-type sideCorrect
(D)the p-type side is at higher potential than the n-type side

Answer: (C)

Solution

When the junction forms, electrons diffuse from n to p and holes from p to n, leaving immobile positive donor ions on the n-side and negative acceptor ions on the p-side of the depletion region. This charge layer produces a built-in electric field

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Question ID VK-100525