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Q.

A n-type silicon sample of width 4x10-3m, thickness and length 6×10-2 m carriers a current of 4.8 mA, when the voltage is applied across the length of the sample. The free electron density is 1022m-3

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a

the current density is 20 A/m2

b

the drift speed is 1.25cm/s

c

the time taken by electrons to travel the full length of the sample is 4.8sec

d

all options are correct

answer is D.

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Detailed Solution

Current density =iA=4.8×10−34×10−3×6×10−2=20A/m2Drift speed =Vd=iAne=201022×1.6×10−19=1.25×10−2m/sTime=t=lVd=6×10−21.25×10−2=4.8 sec

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