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 to P -type side across the junction
• C. An electric field pointing from P -type to N -type side across the junction
• D. A temporary electric field during formation of P-N junction that would subsequently disappear

Answer 1

Answer: (B)

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