Analog Electronics
The leakage electric current of a pn junction is caused by

  majority carriers.
  barrier potential.
  chemical energy.
  heat energy.

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Analog Electronics
A working diode must have

 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward or reverse biased

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