LSU PHYS 2102 - Ampere’s law (13 pages)

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Ampere’s law



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Ampere’s law

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Pages:
13
School:
Louisiana State University
Course:
Phys 2102 - Gen Phys For Tech St
Gen Phys For Tech St Documents

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Physics 2102 Jonathan Dowling Lecture 23 WED 11 MAR Ampere s law QuickTime and a TIFF LZW decompressor are needed to see this picture Andr Marie Amp re 1775 1836 Exam 02 and Midterm Grade Exam 02 Average 63 100 Q1 P1 Dr Schafer Office hours MW 1 30 2 30 pm 222B Nicholson Q2 P2 Dr Gaarde Office hours TTh 2 30 3 30 pm 215B Nicholson Q3 P3 Dr Lee Office hours WF 2 30 3 30 pm 451 Nicholson Q4 P4 Dr Buth Office hours MF 2 30 3 30 pm 222A Nicholson You can calculate your midterm letter grade as posted on paws via this handy formula used by all sections MT01 MT02 500 200 HWT 761 30 530 100 Midterm Score Here MT01 and MT02 are your scores on the first and second midterms and HWT is your total homework points for HW01 07 only Once you have this Midterm Score you then can get your letter grade via A 90 100 B 80 89 C 60 79 D 50 59 F below 50 Details on the grading policy are at http www phys lsu edu classes spring2009 phys2102 I have posted both midterm exam grades and your midterm class score on WebAssign Forces Between Wires Magnetic field due to wire 1 where the wire 2 is L I1 I2 F I B1 0 1 2 a Force on wire 2 due to this field 0L I 1 I 2 F21 L I 2 B1 2 a a Neil s Rule Same Currents Wires Attract Opposite Currents Wires Repel Summary Magnetic fields exert forces on moving charges The force is perpendicular to the field and the velocity A current loop is a magnetic dipole moment Uniform magnetic fields exert torques on dipole moments Electric currents produce magnetic fields To compute magnetic fields produced by currents use Biot Savart s law for each element of current and then integrate Straight currents produce circular magnetic field lines with amplitude B 0i 2 r use right hand rule for direction Circular currents produce a magnetic field at the center given by another right hand rule equal to B 0i 4 r Wires currying currents produce forces on each other Remember Gauss Law for EFields Given an arbitrary closed surface the electric flux through it is proportional to the



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