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

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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 Torques 10 20 30 40 50 Avg Avg = 3.2 = 3.2 Confused Confused Confident Confident Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 2 Today Today ’ ’ s Plan: s Plan: • Review of cross product Review of cross product • Forces & Torques Forces & Torques • Magnetic dipole moment Magnetic dipole moment • Example problem Example problem Key Concepts: Key Concepts: • Forces & Torques on loops of current due Forces & Torques on loops of current due to a magnetic field. to a magnetic field. • The magnetic dipole moment. The magnetic dipole moment. 05 Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 3 F q v B = × r r r Last Time: Last Time: 06 y z x B F I This Time: This Time: F IL B = × r r r B v q F i i r r r × ∑ = B v qN F avg r r r × = Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 4 F IL B = × r r r ACT A B C 08 BB BB Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 5 F IL B = × r r r A B C Act 10 BB BB Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 6 F IL B = × r r r What is the force on section d What is the force on section d-a of the loop? 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 BB BB Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 7 20 40 60 80 Preflight 2 “The total force on a closed current carrying loop is zero.” 13 Physics 212 Lecture 13, Slide Physics 212 Lecture 13, Slide 8 In which direction will the loop rotate? In which direction will the loop rotate?...
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Lect13 - Physics 212 Lecture 13 Slide Physics 212 Lecture...

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