In a $PN-$ junction diode not connected to any circuit:
- AThe potential is the same everywhere.
- BThe $P-$ type side is at a higher potential than the $N-$ type side.
- CThere is an electric field at the junction directed from the $N-$ type side to the $P-$ type side.
- DThere is an electric field at the junction directed from the $P-$ type side to the $N-$ type side.
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