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A surveyor is using a magnetic compass 6.9 m below a power line in which there...

A surveyor is using a magnetic compass 6.9 m below a power line in which there is a steady current of 84 A. Compared to a typical value for Earth's magnetic field of 20 µT, the magnetic field due to the power line is significant and would interfere with the compass reading. What is the magnetic field at the site of the compass due to the power line?

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