In a p-n Junction with no externally app voltage, the drift and diffusion components of the hole and electron currents: 

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  1. must sum to unity separately
  2. must sum to zero
  3. must sum to unity
  4. must sum to zero separately

Answer (Detailed Solution Below)

Option 2 : must sum to zero
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Explanation:

In a p-n Junction, the net current is zero when no bias voltage is applied.

Hence the drift and diffusion components of the hole and electron currents must sum to zero.

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