Analog Electronics
For a reverse biased pn junction, the electric current through the junction increases abruptly at

  0 V.
  breakdown voltage.
  0.2 eV.
  7.2 eV.

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Analog Electronics
For transistor action

  the base region must be very thin and lightly doped.
  the emitter should be heavily doped.
  all of these.
  Je must be forward biased and Jc should be reverse biased.

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