A semiconducting device connected in series with a cell and resistor indicates some current in the circuit. If the polarity of the battery is reversed, the current almost reduces to zero. The device may be:
Correct answer: C. A P-N junction
- A. A P-type semiconductor
- B. An N-type semiconductor
- C. A P-N junction
- D. An intrinsic semiconductor
Explanation
A P-N junction allows current in forward bias and blocks it in reverse bias, matching the described behaviour.
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About Electronics
A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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