Drift current practice problems

Drift current practice problems
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A piece of silicon is p-type with a uniform acceptor doping concentration of N_A = 9.0e+15 cm^-3.
The hole mobility is μ_p = 441 cm²/V·s.
What are the conductivity and resistivity of this silicon?

If an electric field with strength E = 1.0e+4 V/cm is applied to the material, what is the magnitude of the resulting drift current density?

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