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## Homework Statement

This is also a problem on my Masteringphysics:

A solid conducting wire of radius runs parallel to the axis and carries a current density given by J=J(0) * (1 - r/R)[tex]\hat{k}[/tex] , where J(0) is a constant and r is the radial distance from the wire axis.

The parts are the same as in the textbook.

## Homework Equations

biot savart law

J=I/A

## The Attempt at a Solution

I haven't answered part B, or C yet.

ok, when i'm entering my answer for part A on masteringphysics, it keeps telling me "variables are case senstive, make sure that you have the right case on your variables." I've switched them around, and it keeps saying the same thing.

Anyway, my simplified answer is J(0)pi*R[tex]^{2}[/tex](1-[tex]\frac{r}{R}[/tex])

Since J is the current density of the wire, the current is just J*Area, right? That's basically what i'm doing, but something is off. Any help would be great.

Thanks