# Lect13 - Physics 212 Lecture 13 Slide 1 Physics 212 Lecture...

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Unformatted text preview: Physics 212 Lecture 13, Slide 1 Physics 212 Lecture 13 Forces and Torques on Currents Music Who is the Artist? A) Professor Longhair B) Henry Butler C) David Egan D) Dr. John E) Allen Toussaint WHY? Thinking about New Orleans… classics A great piano CD Physics 212 Lecture 13, Slide 3 Your Comments 05 “What are we torque-ing about?” “Why did the current cross the magnetic field??? To get to the other side!” “ Can you seperate all of the right hand rules? ” Three so far: All cross products B field of wire Magnetic moment of current loop Most comments were about torque and associated potential energy/work. We will PRACTICE! “ potential energy stuff is the most confusing otu fo the material ” “ The idea of the direction of the torque. ” “Things are getting so hard... Can we have more office hours than just on Sundays and Mondays? So that we can get a chance to ask about the prelectures and lectures....” “Oh my goodness now things are spinning” “Why is it called a dipole? Where's the dipole?” Physics 212 Lecture 13, Slide 4 Today’s Plan: • Review of cross product • Forces & Torques • Magnetic dipole moment • Example problem Key Concepts: • Forces & Torques on loops of current due to a magnetic field. • The magnetic dipole moment. 05 Physics 212 Lecture 13, Slide 5 F qv B = × a a a Last Time: force on charge 06 y z x B F I This Time: force on wire F IL B = × a a a B v q F i i a a a × ∑ = B v qN F avg a a a × = avg qnAv I nAL N = = Physics 212 Lecture 13, Slide 6 F IL B = × a a a ACT 08 A square loop of wire is carrying current in the counterclockwise direction. There is a horizontal uniform magnetic field pointing to the right. What is the force on section a-b of the loop? A. Zero B. Out of the page C. Into the page Physics 212 Lecture 13, Slide 7 F IL B = × a a a ACT 10 A square loop of wire is carrying current in the counterclockwise direction. There is a horizontal uniform magnetic field pointing to the right. What is the force on section b-c of the loop? A. Zero B. Out of the page C. Into the page Physics 212 Lecture 13, Slide 8 F IL B = × a a a ACT 12 A square loop of wire is carrying current in the counterclockwise direction. There is a horizontal uniform magnetic field pointing to the right. What is the force on section d-a of the loop? A. Zero B. Out of the page C. Into the page Physics 212 Lecture 13, Slide 9 Checkpoint 1a 13 A square loop of wire is carrying current in the counterclockwise direction. There is a horizontal uniform magnetic field pointing to the right....
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Lect13 - Physics 212 Lecture 13 Slide 1 Physics 212 Lecture...

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