Drift current practice problems

Drift current practice problems
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A piece of silicon is n-type with a uniform donor doping concentration of N_D = 7.0e+17 cm^-3.
The electron mobility is μ_n = 202 cm²/V·s.
What are the conductivity and resistivity of this silicon?

If an electric field with strength E = 3.0e+3 V/cm is applied to the material, what is the magnitude of the resulting drift current density?

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