15. 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) concentration of positive and negative charges near the junction
(b) an intrinsic semi-conductor
(c) a p-type semi-conductor
(d) an n-type semi-conductor
Answer : (a) concentration of positive and negative charges near the junction
The device is a P-N diode.
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