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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