# ch19notes - Σ F = | q | vB sin90° = r mv 2 B q mv r | |...

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Chapter 19 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Magnetism Sources: 1) Ferro – Fe, Co, Ni, Nd (permanent magnets) 2) Geo – the Earth itself 3) Electro – currents Characteristics of Magnets: 1) Each has a N and a S pole. 2) N attracts N; N – N and S – S repel. 3) Emit a magnetic field that is directed from N to S. 4) Composed of smaller magnets. Magnetic Field B SI unit: tesla (T) requires right-hand rules to determine direction Magnetic Force on a Moving Charge What happens when you place a magnet near a TV picture tube?? Magnitude F B = | q | vB sin θ B fingers Direction RHR–1 F B knuckles (–) charge v thumb F B palm (+) charge No force when charge is at rest or moving at either 0° or 180° to field! Cyclotron Motion When a charge crosses a B field, it undergoes uniform circular motion:

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Unformatted text preview: Σ 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 θ Direction RHR–3 ** 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 μ = 4 π ×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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