# lecture09 - Currents and Magnetism Physics 102: Lecture 09...

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Unformatted text preview: Currents and Magnetism Physics 102: Lecture 09 Exam 1 Monday night Conflicts, etc.see course home page Be sure to bring your ID and go to correct room Review Sunday, 3-4:30 PM, Rm. 141 I will work through HE1 from last semester (fall 09) To be most useful, you should work the exam yourself prior to the review 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 Force of B-field on Current + v 7 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 + + + + Demo: 184 B force is zero 61% out of the page 23% into the page 16% B I L F= I B Lsin Here = 0. 8 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? demo 253 What is the direction of the force on section b-c of the wire?...
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## This note was uploaded on 01/25/2012 for the course PHYS 102 taught by Professor Lee during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture09 - Currents and Magnetism Physics 102: Lecture 09...

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