Multiple choice

In an unbiased p-n junction, the junction current at equilibrium is

  1. Due to the diffusion of minority carriers only

  2. Due to the diffusion of majority carriers only

  3. Zero because equal and opposite drift and diffusion currents for electrons and holes cross the junction

  4. Zero because no charge crosses the junction

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During the formation of p-n junction, before coming to equilibrium, both diffusion and drift current flows attain equilibrium. Hence, there is no current.

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