# lect09_handout - Physics 102: Lecture 9, Slide 1 Physics...

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Unformatted text preview: Physics 102: Lecture 9, Slide 1 Physics 102: Lecture 9, Slide 1 Currents and Magnetism Physics 102: Lecture 09 Physics 102: Lecture 9, Slide 2 Physics 102: Lecture 9, Slide 2 Summary of Today Last time: Magnetic forces on moving charge magnitude F = qvBsin( ) direction: right-hand-rule Today: Magnetic forces on currents and current loops Magnetic fields due to currents long straight wire solenoid Physics 102: Lecture 9, Slide 3 Physics 102: Lecture 9, Slide 3 Force of B-field on Current + v Force on 1 moving charge: F = q v B sin( ) Out of the page (RHR) Force on many moving charges: F = q v B sin( ) = (q/t) (vt) B sin( ) = I L B sin( ) Out of the page! v L = vt B I = q/t + + + + B Physics 102: Lecture 9, Slide 4 force is zero out of the page into the page B I L F = I B Lsin Here = 0 a b c d B I Preflight 9.1 A rectangular loop of wire is carrying current as shown. There is a uniform magnetic field parallel to the sides a-b and c-d. What is the direction of the force on section a-b of the wire? Physics 102: Lecture 9, Slide 5 force is zero out of the page into the page a b c d B I Preflight 9.2 A rectangular loop of wire is carrying current as shown. There is a uniform magnetic field parallel to the sides a-b and c-d. What is the direction of the force on section b-c of the wire?...
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## This note was uploaded on 02/22/2012 for the course PHYSICS 102 taught by Professor Demarco during the Spring '12 term at University of Illinois, Urbana Champaign.

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lect09_handout - Physics 102: Lecture 9, Slide 1 Physics...

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