Question

if 10 million electrons pass through the cross section of a wire in 0.2 seconds find the value of current flowing in the wire​

Answer 1

Answer:

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