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The knee voltage of a p-n junction diode...

The knee voltage of a `p-n` junction diode is 0.8 V and the width of the depletion layer is `2 mum`, the electric field in the depletion layer is

A

`4 MV//m`

B

`0.4 MV//m`

C

`4 kV//m`

D

`0.4 kV//m`.

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