Analog Electronics
The depletion region of a pn junction is one, that is depleted of

  mobiles charges.
  velocity of the carriers.
  atoms.
  immobile charges.

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Analog Electronics
For an NPN transistor in normal bias

  only majority carriers cross the collector junction.
  Je is forward biased and Jc is reverse biased.
  the emitter junction has high resistance.
  only holes cross the collector junction.

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