Question

In a p-n junction diode notconnected to any circuit

• A. the potential is the same every where
• B. the p-type side has a higher potential than the n-type side
• C. there is an electric field at the junction directed from the n-type side to p-type side
• D. there is an electric field at the junction directed from the p-type side to n-type side

Answer 1

Answer: (C)

there is an electric field at the junction directed from the n-type side to p-type side

Answer 2

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.