Lectures_Lect13

Lectures_Lect13 - Physics 212 Lecture 13 Slide Physics 212...

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Unformatted text preview: Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 1 Physics 212 Physics 212 Lecture 13 Lecture 13 Forces and Torques on Currents Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 2 Key Concepts: Key Concepts: • Forces & Torques on loops of current due to a magnetic Forces & Torques on loops of current due to a magnetic field. field. • The magnetic dipole moment. The magnetic dipole moment. 05 Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 3 06 wire F IL B = r r r Force on a wire carrying current I Cross sectional area A, Length L Number of charges/m 3 = n Each charge moving at V avg each avg F qv B = r r r Force on each charge wire each avg F N F Nqv x B = = r r r r Total force on wire avg qnAv I nAL N = = Use L r B r I wire F r wire F IL B = r r r L r Current- carrying wire in uniform B field I B r Out of page Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 5 F IL B = × r r r ACT A B C 08 Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 6 F IL B = × r r r A B C ACT 10 Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 7 F IL B = × r r r What is the force on section d-a of the loop? What is the force on section d-a of the loop? A) A) Zero Zero B) B) Out of the page Out of the page C) C) Into the page Into the page ACT 12 Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 8 Checkpoint 1a 13 A B C “The net force on any closed loop is zero.” Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 9 In which direction will the loop rotate? In which direction will the loop rotate? (assume the z axis is out of the page) (assume the z axis is out of the page) A) A) Around the x axis Around the x axis B) B) Around the y axis Around the y axis C) C) Around the z axis Around the z axis D) D) It will not rotate It will not rotate x y 15 Checkpoint 1b Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 10 10 R F τ = × r r r R F Checkpoint 1c 17 A B C D E y Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 11 11 Magnetic Dipole Moment Area vector Ma g nitude = Are a Dire c tio n us e s rig ht ha nd rule Magnetic Dipole moment μ r r turns N I A 19 Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide...
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Lectures_Lect13 - Physics 212 Lecture 13 Slide Physics 212...

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