Here are some solutions. Please do not assume perfection and feel free to comment here if you find a discrepancy with your own results, or if you are just not sure about something. For example, in #5, I am puzzled about the value used for $n_i$. I thought it was about $10^{10} cm^{-3}$ ?
Also, maybe the drift current should be negative...
I have persistent trouble in converting from cm to m.
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