MHTCET 16 May 2024 Shift 1 Paper

Concept:In an unbiased $p$-$n$ junction, a built-in electric field and a potential difference exist across the depletion region.Explanation:At the junction, electrons diffuse from the $n$-side to the $p$-side, leaving positive ions on the $n$-side and negative ions on the $p$-side.This creates an electric field directed from the $n$-side to the $p$-side.Hence, the $n$-side is at a higher potential, i.e., positive voltage, relative to the $p$-side.Answer:C. An electric field is established at the junction such that $n$ side is at positive voltage relative to $p$-side.