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An extrinsic semiconductor sample of cross-section A and length L is...

This question belongs to Engineering Physics Solid State Physics
Solid State Physics
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An extrinsic semiconductor sample of cross-section A and length L is doped in such a way that the dopping concentration varies as $${N_D}\left( x \right) = {N_0}\exp \left( { - \frac{x}{L}} \right),\,{N_0}$$      is a constant. Assume that the mobility $$\mu $$ of the majority carriers remains constant. The resistance R of the sample is given by

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Correct Answer: Option C
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