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A semiconducting device is connected in ...

A semiconducting 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

A

A P-type semiconductor

B

An N-type semiconductor

C

A PN-junction

D

An intrinsic semiconductor

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The correct Answer is:
C
When polarity of the battery is reversed, the P-N junction becomes reverse biased so no current flows.
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