20. If you doubled your distance from a long currentcarrying wire, what changes would need to be...
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20. If you doubled your distance from a long currentcarrying wire, what changes would need to be made to the current to keep the magnetic field strength the same as at the nearer position but reversed direction?
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Related Book For 
College Physics Essentials Electricity And Magnetism Optics Modern Physics Volume Two
ISBN: 9781032337272
8th Edition
Authors: Jerry D. Wilson, Anthony J. Buffa, Bo Lou
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