# Lec13 - Lecture 13 Lecture 13-1 Magnetic Field Permanent...

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Unformatted text preview: Lecture 13 Lecture 13-1 Magnetic Field Permanent magnets: rocks from Magnesia, compass needle, bar magnet, … • No net charge – no interactions withstationary charges • Interactions-among themselves, N-S poles of the earth, with materials such as iron, nickle, tapes, disks, … moving charges magnetism action at distance like E Define B by interaction with a moving charge q magnetic field Lecture 13 Lecture 13-2 Magnetic Field B •Magnetic force acting on a moving charge q depends on q, v. F qvB = × ca aca This defines B . direction by Right Hand Rule. B is a vector field ( ) / F N N B Ttesla qv Cms Am = = = = ⋅ ⋅ 1 T = 10 4 gauss (earth magnetic field at surface is about 0.5 gauss) Vary q and v in the presence of a given magnetic field and measure magnetic force F on the charge. Find: F v F qv ⊥ ∝ ca a F varies sinusoidallyas direction of v is changed (q>0) vB × aca If q<0 , sin F vBF qvB θ ⊥ = ca aca Lecture 13 Lecture 13-3 Magnetic Force on a Current •Consider a current-carrying wire in the...
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## This note was uploaded on 04/27/2008 for the course PHYS 241 taught by Professor Wei during the Spring '08 term at Purdue.

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Lec13 - Lecture 13 Lecture 13-1 Magnetic Field Permanent...

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