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When a semiconducting device is connedte...

When a semiconducting device is connedted in series with a battery and a resistance. A current is found to flow in the circuit. If however, the polarity of the battery is reversed. Practivally no current flows in the circuit. The decise may be

A

a p-type semiconductor

B

a n-type semiconductor

C

an intrinsic semiconductor

D

a p-n junction

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