Which is the wrong statement in following sentences? A device in which $P$ and $N$-type semiconductors are used is more useful then a vacuum type because
  • A
    Power is not necessary to heat the filament
  • B
    It is more stable
  • C
    Very less heat is produced in it
  • D
    Its efficiency is high due to a high voltage across the junction
[MP PET 1992]
art

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