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A semiconductor device is connected in a series circuit with a battery and a resistance. Current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to zero. The device may be

A semiconductor device is connected in a series circuit with a battery and a resistance. Current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to zero. The device may be Correct Answer p-n junction

CONCEPT:

  • The material having electrical conductivity less than that of conductor and more than that of an insulator is called as the semiconductor.
  • The semiconductor having holes as majority charge carriers is called as P-type semiconductor.
  • The semiconductor having electrons as majority charge carriers is called as N-type semiconductor.
  • The semiconductor which has no doping is called as the intrinsic semiconductor.
  • The device which uses semiconductor for the construction and working is called as semiconductor device.
  • The device in which the current is flowing in the circuit when it is forward biased and there is no current in the circuit when it is reversed biased is called as p-n junction.

EXPLANATION:

  • As in case of p-n junction there is current only in forward biasing. If there is a reversed biasing then-current reduces to zero.
  • Here in this case if the polarity is reversed then the p-n junction becomes reversed biased, so there is zero current in the circuit. Hence option 4 is correct.
  • Current through the intrinsic semiconductor and extrinsic semiconductor is independent of polarity. So options 1, 2 and 3 are wrong.

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