29. Sources of Magnetic Field
Magnetic Field Produced by Straight Currents
8:22 minutes
Problem 28.16
Textbook Question
Textbook Question(II) A dc power line carries a current of 85 A west along the tops of 8.5-m-high poles. (a) What is the magnitude and direction of the magnetic field produced by this wire at the ground directly below? How does this compare with the Earth’s field of about ½G ? (b) Where would the current’s magnetic field cancel the Earth’s field?
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