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A semi-conducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be

1. a p-n junction
2. an intrinsic semi-conductor
3. a p-type semi-conductor
4. an n-type semi-conductor

Correct answer: a p-n junction

Solution

The described behavior of allowing current in one direction and blocking it in the reverse direction is characteristic of a p-n junction diode. This property is due to the formation of a depletion region at the junction, which allows current flow only when forward-biased.

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