Question

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

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

Answer 1

The correct option is B An electric field pointing from N-type side to P-type side across the junction.

Without an external bias, an electric field exists which points from N-type side and opposes any diffusion of electrons.