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## Homework Statement

http://s619.photobucket.com/albums/tt272/babyazureyoshi/?action=view¤t=014.jpg

## Homework Equations

1) B_x = (µ_0 * I) / 2R at x = 0

## The Attempt at a Solution

I know that segments BC and DA do not contribute to the magnetic field at O so all I need to know is the contribution for segments AB and CD. Using equation one, I simplified the formula to ((µ_0 * I) / 2) * ((1/0.6) +(1/0.4)).

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