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## Homework Statement

A copper wire of diameter 2.00mm carries a current of 0.50A.The number of conducting electrons per metre cube of copper is 8.00 x 10^28.

a)Calculate the drift velocity of the conducting electrons.

b)What is the number of conducting electrons in 10.0cm length of the wire

## Homework Equations

I=nave

v=I/nae

## The Attempt at a Solution

a) I=nave

v=I/nae

= 0.50/(8.00x10^25)(1x10^-3)(1.6x10^-19)

=3.9 x 10^-5 ms^-1

b)I=nave

n=I/ave

=0.50/(1x10^-3)(3.9x10^-5 )(1.6x10^19)

=8.0x 10^-3

The answer that i get is wrong.i dunno why.I need help and explanation.Is it need to derivate the formula then calculate?Thank you.