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**1. Homework Statement**

The force on a wire .80 m long that is perpendicular to the Earth's magnetic field is .12 N. What current flows throught the wire? (Earth's magnetic field is 1.0x10^-4 T at the poles and 5.0x10^-5 T at the equator)

**2. Homework Equations**

Fm=BIl

Fm is magnetic force in N, B is magnetic field strength in telsa (T), and l is length in meters.

**3. The Attempt at a Solution**

I'm just not sure what I'm supposed to use for B. Do I use the strength at the poles? at the equator? Some combination of the two?

Thanks.