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a Bar of intrinsic
-3
silicon having a cross-sectional area of 3x10-4 m² has an
n; = 1.5×10¹6 m²³. If n = 0.14 m² /V.sand up = 0.05 m²/V.s, how long should the bar be in
order that the current in it be 1.2 mA when 9 V is applied across its ends.

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