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Standard XII
Physics
Question

In a p-n junction diode, not connected to any circuit
  1. the potential is same everywhere.
  2. the p-type side is at a higher potential than the n-type side.
  3. there is an electric field at the junction directed from the n-type side to the p-type side.
  4. there is an electric field at the junction directed from the p-type side to the n-type side.

A
there is an electric field at the junction directed from the p-type side to the n-type side.
B
there is an electric field at the junction directed from the n-type side to the p-type side.
C
the potential is same everywhere.
D
the p-type side is at a higher potential than the n-type side.
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Solution
Verified by Toppr

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

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