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Unformatted text preview: F = | q | vB sin90 = r mv 2 B q mv r | | Chapter 19 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Magnetic Force on a Current-Carrying Wire Magnitude F B = ILB sin Direction RHR3 ** applications: meters, motors, speakers Electromagnetism how current creates magnetism Long Straight Wire I thumb Magnitude r I B 2 r Direction RHR-2 B fingers = 4 10 7 T-m/A permeability of free space Force between Parallel Current-Carrying Wires: d L I I F B 2 2 1 attraction repulsion Solenoid (Coil of N turns and a length L ) B thumb Magnitude L NI B Direction RHR-3 I fingers sucking magnet used in car starters, electric door locks MRI machines...
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