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3.
You are conducting a magnetic survey in Minnesota with a proton-precession magnetometer
with a sensitivity of 1 nT. Make some simplifying assumptions (e.g. I=90°) and estimate how far away
from the magnetic senor you need to be from a 2000-pound (=1 ton) car (on the surface) so that the
magnetic signal is less than 1 nT? The magnetic moment for typical iron and steel objects is 100
Am/ton.

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