An $N-P-N$ transistor conducts when:

  • A
    Both collector and emitter are positive with respect to the base.
  • B
    Collector is positive with respect to the base and emitter is negative with respect to the base.
  • C
    Collector is positive,and emitter and base are at the same potential.
  • D
    Both collector and emitter are negative with respect to the base.

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