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Electricity

Blazing goIITian

 Joined: 1 Apr 2012 Post: 381
22 Aug 2012 21:15:15 IST
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Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Electricity

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

Hot goIITian

Joined: 26 May 2011
Posts: 166
23 Aug 2012 10:52:30 IST
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### hi,

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

i=neAv

put the values and u will get

v=0.074mms^-1.

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