In a pn junction diode not connected to any circuit
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a
The potential is the same everywhere
b
The P type side 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
answer is C.
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Detailed Solution
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.