Electric charges flow through a wire shaped as shown in Fig. 25-3. The cross-sec

Question

 

Electric charges flow through a wire shaped as shown in Fig. 25-3. The cross-sectional areas are A1= 4 mm2 and A2 = 1 mm2 respectively. What is the drift velocity of the electrons in the narrow section of the wire if their velocity is 0.08 m/s in the wider region?

Electric charges flow through a wire shaped as shown in Fig. 25-3. The cross-sectional areas are A1= 4 mm2 and A2 = 1 mm2 respectively. What is the drift velocity of the electrons in the narrow section of the wire if their velocity is 0.08 m/s in the wider region?

Explanation / Answer

I=nAvQ since current(I),no.of electrons(n),charge of electron(Q) is same in both the sections Av in first part should be equal to second part A1*v1=A2*v2 4*.o8=1*v2 v2=.32m/s

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