 #1
zoyash
 1
 0
 Homework Statement:

The current density across a cylindrical conductor of radius R varies according to the
equation J=α(r−r2/R), where r is the distance from the axis. Thus the current density is a
maximum J0 at the axis r=0 and decreases linearly to zero at the surface r=R in which α is a constant.
What is the current through the outer portion of the wire between radial distance R/3
and R. Take R=2mm and α=2*105 A/m2
 Relevant Equations:
 J=α(r−r2/R)
I have attached my solution to this problem but I think I got the wrong answer.