Question

A copper wire of radius 2mm carries a current of 1.5 milli amp. Find the current 12. density​

Answer 1

Answer:

Solution



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Given that,

Length l=0.2m

Area A=1mm2

Voltage V=4v

Electron mobility μ=4.5×10−6m2/s

Charge e=1.6×10−19C

Number density n=8.5×10−18m3

We know that,

The current flows is

  I=neAvd

 I=neAμlV

 I=8.5×1028×1.6×10−19×10−6×4.5×10−6×0.24

 I=1224×10−3A

 I=1.22A