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Download Week 7: Magnetic Fields and Magnetic Fields due to Currents
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Applied Physics II : SCS139 Week 7 1 Weekly Outline • Magnetic Fields • Magnetic Fields due to Currents 2 Magnetic Fields Definition of the magnetic field: B q v When a charged particle moves inside a magnetic field, there is a force due to the field on the particle. This amount of force is used to defined the magnetic field. 3 Magnetic Fields F is always perpendicular to v. No change in kinetic energy. 4 Magnetic Fields 5 Magnetic Field Lines North pole South pole 6 Magnetic Field Lines North pole South pole 7 Crossed Fields: Thompson’s Experiment 8 A Circulating Charged Particle 9 A Circulating Charged Particle 10 A Circulating Charged Particle nonuniform magnetic field 11 A Circulating Charged Particle nonuniform magnetic field The Aurora 12 The Cyclotrons 13 Magnetic Force on a Current-Carrying Wire 14 Torque on a Current Loop 15 Torque on a Current Loop 16 Magnetic Fields Due to Currents 17 Magnetic Fields Due to Currents 18 Magnetic Fields Due to Currents 19 Magnetic Fields Due to Circular Arc of Wire 20 Force Between Two Parallel Currents 21 Ampere’s Law 22 Ampere’s Law 23 Ampere’s Law 24 Solenoids 25 Solenoids 26 Toroids 27 Magnetic Dipole Moment 28 A Current-Carrying Coil as a Magnetic Dipole 29 A Current-Carrying Coil as a Magnetic Dipole 30