If no external voltage is applied across `P-N` junction, there would be

Options

A. No elctric field across the junction
B. An electric field pointing from `N`-type to `P`-type side across the junction
C. An electric field pointing `P` -type to `N` -type side across the junciton
D. A temperary electric field during formation of `P-N` junction that would subsequently disappear

Answer

B

Explanation

Across the `P-N` junction, a barrier potential is developed whose direction is form `N` region to `P` region.