w09ch19notesforweb

w09ch19notesforweb - Physics 1B schedule Winter 2009...

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Physics 1B schedule Winter 2009. Instructor: D.N. Basov [email protected] HW: Ch15: 1,10,11,13,15,17,20,24,27,28,30,32,36,38,43,46,48 Ch16: 1,3,5,8,12,15,19,22,23,25,29,31,33,35,43,45,47,49,60 Ch17: 1,3,8,9,11,13,16,19,20,23,31,33,39,45,52,60 Ch18: 1,3,5,7,13,17,21,26,31,33,35, Ch19: 1,3,8,9,11,15,19,22,24,27,29,34,37,38,41,44,47,49,57,61 Ch20: 1,5,8,11,13,16,18,23,25,27,29,31,34,37,39, Quizzes: Final exam: all material in ch 15-21 HW problems, problems in class, more… no make up final for any reason 4 best out of 5 No make-up quizzes for any reason OH Fri 4-5pm, 6-7pm Lecture: discussion of the final exam Lecture: AC circuits Lecture: Energy of the magnetic field 10: March 9 Quiz 5: chapter 20 Lecture Inductance, Inductors Lecture: Faraday’s law, Lenz’s law 9: March 2 Induced EMF Quiz 4: chapter 19 Lecture: current loop, solenoid 8: Feb 23 Lecture: torque on current loop, Ampere’s law Lecture: Magnetism University Holiday 7: Feb 16 Quiz 3: chapter 17-18 Lecture: RC circuits Lecture: Kirchhoff’s rules 6: Feb 9 Lecture: Resistors, series parallel Lecture: Ohm’s Law Resistivity, Electric power Lecture: Capacitors with dielectrics, Electric current 5: Feb 2 Quiz 2: chapter 16 Lecture: capacitor combinations Lecture: capacitance 4: Jan 26 Quiz 1: chapter 15 Lecture: Potential University Holiday 3: Jan 19 Lecture: Gauss law/examples Lecture: Electric Flux & Gauss’s law 2: Jan 12 Lecture: the Electric field Lecture: The Coulomb law, Lecture: Intro, 15.1-15.3 1:Jan 5 Friday Wed Mon Week T.A.: A: Zhoushen Huang [email protected] B: Andreas Stergiou, [email protected] Last update: Jan 30, 2009
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19 Magnetism
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Bar Magnet [19-1] • Bar magnet ... two poles: N and S Like poles repel; Unlike poles attract. • Magnetic Field lines: (defined in same way as electric field lines, direction and density) Does this remind you of a similar case in electrostatics? N S
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Magnetic Field Lines of a bar magnet Electric Field Lines of an Electric Dipole N S E r B r Bar Magnet [19-1]
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Magnetic field produces force on moving charges B v θ F q A charge q moving with velocity v in a magnetic field B experiences a force F. sin Fq v B = Force: Depends on the velocity and magnetic field Depends on angle between vectors v and B Is max when vectors v and B are perpendicular Is perpendicular to the direction of B and v 19.3 Magnetic Fields
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19.3 Magnetic Fields sin Fq v B θ = F r F r + direction of F given by the right hand rule -- F r Force: Depends on the velocity and magnetic field Depends on angle between vectors v and B Is max when vectors v and B are perpendicular Is perpendicular to the direction of B and v B v F q
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Magnetic field magnitude defined sin sin Fq v B F B qv θ = = Units of B: Ns Cm = Tesla (T) Also commonly used gauss (g) 10 4 gauss=1Tesla 19.3 Magnetic Fields Nicola Tesla 1865-1943
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Magnetic field notations x x x x x x x x x x x x x x x x x x B field into page B field out of the page think of arrows 19.3 Magnetic Fields
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19.3 Magnetic Fields Electric Field: Magnetic Field:
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Electric Field vs. Magnetic Field Electric Magnetic Source Charges Moving Charges Acts on Charges Moving Charges Force F = Eq F = q v B sin( θ ) Direction Parallel E Perpendicular to v,B Field Lines Magnetic Field:
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length L in a perpendicular B field F F= sum of forces on all charges = qvB FB I L = L since q= ρ LA then F= ρ LAvB q IA v t = Finally ρ is the charge/volume I q B A since L Magnetic force on a current carrying wire 19.4
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w09ch19notesforweb - Physics 1B schedule Winter 2009...

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