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## Homework Statement

There is a wire with current I ,charge density j, and radius R. Find the Magnetic Field outside the wire (a>r) and inside the wire (a<r).

## Homework Equations

Biot- Savart or Amperes law

I=JdotA

## The Attempt at a Solution

Not sure how to attempt it or which equation to use. From my previous question about solenoids, I know that Magnetic Field only depends on length of L, not radius of wire..