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Choose the correct option

A

`mu=v_(d)//E,mu:` mobility `(m^(2)//V s).v_(d):` drift speed, `E:` Electric field

B

Conductivity of conductors, `sigma=n_(e)mu_(e)e`

C

Conductivity of semiconductors, `sigma=n_(e)mu_(e)e+n_(h)mu_(h)e,`

D

All option are correct

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The correct Answer is:
D
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