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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(a) a p-n junction
because when a p- n junction is reversed biased it offers very high resistance due to which current drops to almost zero.
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