3.9 Find the length of a silicon bar having a 5-µm × 4-µm cross section and having free-electron and hole densities of 104/cm3 and 1016/cm3, respectively, so that 0.2 mA current flows when 1 V is applied end-to-end. Use μn = 1200 cm2/V · s and μp = 500 cm2/V · s.

8 m

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