First slide
P-N junction
Question

 The correct curve between potential and distance near P-N junction is

Moderate
Solution

Within the depletion region, electric field is uniform and it is directed from N region to P region. So potential in the N region is more due more concentration of positive ions and at the middle potential is zero and in the P region it is negative due accumulation of negative ions, so graph 1 is correct. 

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