# ASSIGN5 - Section Name Section Instructor Assignment 5...

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Section: ______ Name: ______________________________ Section Instructor: ______________________________ Assignment 5: Currents as Sources of Magnetic Field Concepts: r B due to currents Biot-Savart law long straight wire Ampere’s law solenoid magnetic flux Reading in text: Chapter 29: Sections 1-5. Assignment: Solutions posted on Friday, March 2. Quiz may be given on or after Tuesday, March 6. 1. How large are the magnetic fields produced underneath power lines? Consider a somewhat idealized high-voltage power line in which two parallel cables are suspended horizontally at the same height h above the ground. A current flows out along one cable and back along the other. The two cables are separated by a horizontal distance d . Find the direction and magnitude of the magnetic field i r B produced at the ground at a point equidistant from the two cables. Use your result to estimate B at this point if h = 12 m , d = 4 m , and i . How does your value compare with the strength of the Earth’s field (approximately 0.5 gauss or )?

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