Question

In 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

Answer 1

hey......
✔✔ After joining p - type & n - type semiconductors, electrons from the n - region near the p - n interface tend to diffuse into the p - region.

As electrons diffuse, they leave positively charged ions ( donors ) in the n - region.

likewise, holes from the p - type region near the p - n interface begin to diffuse into the n - type region, leaving fixed ions ( acceptors ) with negative..

Thus, an electric field is established at the junction directed from the n - type side to the p - type side..

✅✅Hence , option C is correct answer.....
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i hope this helps u......
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Answer 2

In a p-n junction which is out of circuit (c) the electric field at the junction directed from N type to P type.

●When p n junction is unbiased electrons from n region diffuse into p region whereas holes from p region diffuse to n region.

●The accommodation of negative charges in p region and positive charge in n region sets potential difference across junction.

●This acts as barrier and is called barrier potential which sets up barrier field in direction from n region to p region.

●Thus electric field is established from n terminal to p that is from n region to p region.