In a PN-junction diode not connected to any circuit

The potential is the same everywhere

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The P-type is a higher potential than the N-type side

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There is an electric field at the junction directed from the N- type side to the P- type side

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There is an electric field at the junction directed from the P-type side to the N-type side

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Solution

The correct option is C There is an electric field at the junction directed from the N- type side to the P- type side
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

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