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In semiconductor the concentrations of electrons and holes are $8 \times 10^{18} / m^{3}$ and $5 \times 10^{18} / m^{3}$ respectively. If the mobilities of electrons and holes are $2.3 m^{2} / V - \sec & 0.01 m^{2} / V - \sec$ respectively, then semiconductor is

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N – type and its resistivity is 0.34 ohm – metre

P – type and its resistivity is 0.034 ohm – metre

N – type and its resistivity is 0.034 ohm – metre

P – type and its resistivity is 3.40 ohm – metre

answer is A.

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Detailed Solution

$σ = e (n_{e} μ_{e} + n_{H} μ_{H})$

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