A power line carries a current of 97 a west along the tops, Ask an Expert

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But the direction of the magnetic field is different. If your right thumb points along the current, the magnetic field curls around the wire in the direction of your fingers. A power line carries a current of 97 A west along the tops of 9.0 m-high poles. What is the direction and the magnitude of the magnetic field produced at the ground?

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