# Lect12 - Physics 212 Lecture 12 Today's Concept: Magnetic...

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Physics 212 Lecture 12, Slide 1 Physics 212 Lecture 12 Today's Concept: Magnetic Force on moving charges = × a a a F qv B

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Physics 212 Lecture 12 Music Who is the Artist? A) Michael McDonald B) Van Morrison C) Glenn Frey D) Robert Palmer E) David Bowie My favorite Van the Man album… Many of my friends agree that this one is on the list of 10 albums you must have on a desert island. . What does that say about my friends?? Did you know he wrote “Gloria”. . He did! From Last time: Really. . Incredible “Send in the Clowns” By Van the Man A Classic, Of Course !
Physics 212 Lecture 12, Slide 3 Your Comments 05 “Will there be exciting demonstrations showing off the power of magnetism?” “Can you do a demo of a huge magnet picking up something like a car or a boat? Thanks.” Some cool ones as we go along “We most definitely need examples. Also, every time you post an awful pun, a puppy dies. Just so you know.” “Some concepts remain confusing, such as the difference between electric fields and magnetic fields” “This is way conceptual. Can we make it more tangible?” All good questions! But very deep! “(I'm probably not being very original with this one) Magnets: how do they work?” “I'm confused as to where F=qv*B comes from” “understood most of it. the right hand rule part threw me off a bit.” “I'm still confused about how to use the right hand rule with magnetic fields.” You are not the only ones! A little at a time!

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Physics 212 Lecture 12, Slide 4 Today’s Plan: 1) Review of magnetism 2) Review of cross product 3) Example problem Key Concepts: 1) The force on moving charges due to a magnetic field. 2) The cross product. 05
Physics 212 Lecture 12, Slide 5 Magnetic Observations N S • Bar Magnets • Compass Needles S N N S N S N S N S N S cut in half 07 N S Magnetic Charge?

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Physics 212 Lecture 12, Slide 6 • Compass needle deflected by electric current I • Magnetic fields created by electric currents • Direction? Right thumb along I, fingers curl in direction of B • Magnetic fields exert forces on electric currents (charges in motion) V V I I F F V I I F F Magnetic Observations 12
Physics 212 Lecture 12, Slide 7 All observations are explained by two equations: = × a a a F qv B Today 0 2 ˆ 4 μ π × = a a I ds r dB r Next Week 14

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Physics 212 Lecture 12, Slide 8 Cross Product Review • Cross Product different from Dot Product A B is a scalar; A x B is a vector A B proportional to the component of B parallel to A A x B proportional to the component of B perpendicular to A • Definition of A x B Magnitude: ABsin θ Direction : perpendicular to plane defined by A and B with sense given by right-hand-rule 16
Physics 212 Lecture 12, Slide 9 Remembering Directions: The Right Hand Rule F qv B = × a a a x y z B F qv 17

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Physics 212 Lecture 12, Slide 10 Three points are arranged in a uniform magnetic field. The B field points into the screen. 1) A positively charged particle is located at point A and is stationary.
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## This note was uploaded on 03/12/2012 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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Lect12 - Physics 212 Lecture 12 Today's Concept: Magnetic...

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