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An $npn$ bipolar junction transistor (BJT) is operating in the active region. If the reverse bias across the base-collector junction is increased, then

  1.  the effective base width increases and common-emitter current gain increases
  2.  the effective base width increases and common-emitter current gain decreases
  3.  the effective base width decreases and common-emitter current gain increases
  4.  the effective base width decreases and common-emitter current gain decreases
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