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A semi-conducting device is connected in...

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

A

a `p n` junction

B

an intrinsic semi-conductor

C

a `p`-type semi-conductor

D

an `n`-type semi-conductor.

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