The radius of an alıminum wire is 2 cm,and the speed of free electrons is 3.6x10-4 m/s. The load passing through the unit section of this wire varies as q(1) = (3t3-t2+4t-10)C .
In 10 s, the unit section of the wire find the passing charge,current intensity,current density,number of free electrons and resistance per length?
Now since
So in 10s the charge passing through unit cross section is
So at 10s current intensity will be,
Current density
In 10 seconds the free electrons move through a distance of
and charge =2930C which contains
electrons
So free electrons per unit length will be
electrons/m
I don't think enough info is given to calculate the resistance per unit length
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