- #1

cdotter

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## Homework Statement

[PLAIN]http://img710.imageshack.us/img710/3483/71071851.png

## Homework Equations

n/a

## The Attempt at a Solution

I understand everything except "the forces on the top and bottom segments cancel."

How do I figure out that they cancel? I understand that a force is orthogonal to both the current flow and the magnetic field...but there's no magnetic field given?

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