The net charge on an N-type substance is:
Correct answer: A. Neutral (0)
- A. Neutral (0)
- B. Positive
- C. Negative
- D. Variable
Explanation
An N-type semiconductor is doped with pentavalent elements, which introduce additional free electrons. However, the semiconductor remains electrically neutral because the negative charge of these free electrons is balanced by the positive charge of the ionized donor atoms. Therefore, the net charge of an N-type semiconductor is zero, or neutral. The other options incorrectly suggest that the semiconductor itself carries a net positive or negative charge, which is not the case under normal conditions.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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