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:
- 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.
