Lect14 - Physics 212 Lecture 14, Slide 1 Physics 212...

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Unformatted text preview: Physics 212 Lecture 14, Slide 1 Physics 212 Lecture 14 Biot-Savart Law 2 4 I ds r dB r = a a :05 Music Who is the Artist? A) Professor Longhair B) John Cleary C) Allen Toussaint D) David Egan E) Henry Butler Theme of week: New Orleans piano players If you have a chance to ever see him, DO I never miss him at Jazzfest Physics 212 Lecture 4 Physics 212 Lecture 14, Slide 3 Your Comments 05 torque on current carrying wires direction of torque! The torque stuff confuses me beyond belief. Torque is always rXF We will discuss torque for wires I am very confused with the checkpoints. I don't understand how to find the net torque of wires!!!!! We need a catchy or an easy way to remember how to differentiate between all the different right-hand rules. Too many variations of the right hand rule. besides that, everything is confusing See next slide Too many right hand rules. I had to use my left hand sometimes... If I miss any that will be my excuse. Hour Exam II Wed. Oct. 26 Can we go over most of the checkpoints, concepts seem to be getting more difficult now. Physics 212 Lecture 14, Slide 4 Right Hand Rule Review 06 1. ANY CROSS PRODUCT B v q F a a a = B L I F a a a = F r a a = B a a = 2 4 I ds r dB r = a a 2. Direction of Magnetic Moment Thumb: Magnetic Moment Fingers: Current in Loop 3. Direction of Magnetic Field from Wire Thumb: Current Fingers: Magnetic Field Physics 212 Lecture 14, Slide 5 Biot-Savart Law: :05 What is it? Fundamental law for determining the direction and magnitude of the magnetic field due to an element of current We can use this law to calculate the magnetic field produced by ANY current distribution BUT Easy analytic calculations are possible only for a few distributions: Infinite Straight Wire Axis of Current Loop Plan for Today: Mainly use the results of these calculations!! GOOD NEWS: Remember Gauss Law? Allowed us to calculate E for symmetrical charge distributions NEXT TIME: Introduce Amperes Law Allows us to calculate B for symmetrical current distributions Physics 212 Lecture 14, Slide 6 B from infinite line of current Current I OUT r = distance from wire 7 4 10 / Tm A - = 2 I B r = r Magnitude: B :07 Integrating gives result 2 4 I ds r dB r = a a Direction: Thumb: on I Fingers: curl in direction of B Physics 212 Lecture 14, Slide 7 A long straight wire is carrying current from left to right. Two identical charges are moving with equal speed. Compare the identical charges are moving with equal speed....
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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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Lect14 - Physics 212 Lecture 14, Slide 1 Physics 212...

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