A current of 1A exists in a copper wire of cross-section 1mm^2. Assuming one free electron per atom calculate the drift speed of the free electron in the wire. The density of copper is 9000kgm^-3. ????????Answer __0.074mms^-1
i = 1 A, A = 1 mm2 = 1 x 10–6 m2
density cu = 9000 kg/m3
Molecular mass has N0 atoms= m Kg has (N0/M x m) atoms
=No x A x 9000/63.5 x 10^ -3
no. of atoms= no. of electrons.
n = no. of electrons/unit volume
=No x A x density/mAl
=No x density/M
=6 x 1o^23 x 9000/63.5 x 10^ -3
put the values and u will get
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