JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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A semiconductor 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 revered, the current drops almost to zero. The device may be

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Correct option: C

p - n

junction

Option C (A

p - n

junction) is correct because a p-n junction allows current to flow in one direction (forward bias) and blocks it in the opposite direction (reverse bias).

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A PN-junction has a thickness of the order of In a

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N

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P

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\mathrm{\alpha\; and\; \beta }

of a transistor