Modern Physics 6 Question 23

25. In a $p$ - $n$ junction diode not connected to any circuit

(a) the potential is the same everywhere.

(1998, 2M)

(b) the $p$-type side is at a higher potential than the $n$-type side.

(c) there is an electric field at the junction directed from the $n$-side to the $p$-type side.

(d) there is an electric field at the junction directed from the $p$-type side to the $n$-type side.

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Solution:

  1. At junction a potential barrier/depletion layer is formed, with $n$-side at higher potential and $p$-side at lower potential. Therefore, there is an electric field at the junction directed from the $n$-side to $p$-side.


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