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Unformatted text preview: 1 Physics 202, Lecture 12 Todays Topics Magnetic Field (Ch 29, part II) Force on Current Carrying Wires For and Torque on a Current Loop In Uniform B Field Magnetic dipoles Motion of a Charged Particle In a Uniform B Field Applications: Magnetic Confinement First Modern Particle Accelerator: Cyclotron Mass Selector (q/m) Hall Effect. Magnetic Force On Current Carrying Wire Segment (Review of Last Lecture) Magnetic force on a current segment of length L in uniform field B : F B = q v x B = I L x B Key steps to derive: Current: moving charges. I = qnv d A Magnetic force on charge q: q v d x B d F B =q v d x B (ALn) = I L x B Demo: Magnetic Force On A Current Carrying Wire Top View Also demo: Bending electron beam Magnetic Force On Current Carrying Wire Magnetic force on a curved wire in uniform field B : F B = I L x B Derivation: See board Note Net force on a current B Note:Net force on a current loop in uniform B field is zero L I d s 2 Review Exercise: Forces On A Current Loop...
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