Q: If a PN-junction diode not connected to any circuit
(a) the potential is the same everywhere
(b) the P-type is a higher potential than the N-type side
(c) there is an electric field at the junction directed from the N-type side to the P-type side
(d) there is an electric field at the junction directed from the P-type side to the N-type side
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Ans: (c)