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## Homework Statement

## Homework Equations

[tex]\vec B = \frac{\mu i \phi}{4 R}[/tex]

## The Attempt at a Solution

The field due to the curve R_1 is:

[tex]\vec B = \frac{\mu i \phi}{4 R}[/tex]

[tex]\vec B = \frac{(1.26x10^-6)(.281)(\pi)}{4 (.023)} = -1.21x10^-5 \hat k [/tex]

The field due to the curve R_2 is:

[tex]\vec B = \frac{(1.26x10^-6)(.281)(\pi)}{4 (.066)} = 4.21x10^-6 \hat k[/tex]

Add 'em up and you get [itex]-7.88x10^-6 k[/itex] but apparently it's wrong.

What the heck am I doing wrong?? I even derived the formula separate from the book to ensure I knew what was going on.