Multiple choice

A p +n junction has a built-in potential of 0.8 V. The depletion layer width at a reverse bias of 1.2V is 2 $\mu$m. For a reverse bias of 7.2 V, the depletion layer width will be

  1. 4 $\mu$m
  2. 4.9 $\mu$m
  3. 8 $\mu$m
  4. 12 $\mu$m
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