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## General Physics

by: Nichole Keebler

6

0

6

# General Physics PHYSICS 202

Nichole Keebler
UW
GPA 3.95

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COURSE
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6
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25 ?

## Popular in Physics 2

This 6 page Class Notes was uploaded by Nichole Keebler on Thursday September 17, 2015. The Class Notes belongs to PHYSICS 202 at University of Wisconsin - Madison taught by Bruce Mellado in Fall. Since its upload, it has received 6 views. For similar materials see /class/205213/physics-202-university-of-wisconsin-madison in Physics 2 at University of Wisconsin - Madison.

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Date Created: 09/17/15
Physics 202 Lecture 26 Today s Topics l Wave Nature of Waves Interference Breakdown of ray approximation Huygen s principle Light as Waves DoubleSlit Interference MultiSlit Interference Ray Approximation El When the wavelength of the light is much smaller than the size of the optical objects it encounters it can be treated as colored rays i g T L xiltltd 12d V V Ray approximation Ray approximation is not valid near the gap is valid when kltltd when Ad OK elsewhere Reminder Light and Optics El Nature of Lights Lights as rays Lights as EM waves f A 1 v A interference Lights as group of photons El Optics Physics of lights Geometric Optics Treat light as rays Ch 3536 9 Ray approximation Wave Optics Wave properties becomes important Interferences diffractionCh 3738 The Huygens Principle El Every point on a wave front can be considered as a secondary source of waves that spread out in the forward direction The new wave is the result of the superposition of these secondary waves Source 0 S DoubleSlit Experiment Explained CI The experiment can be easily explained by interference I V U b Constructive A On 2a 475 Destructive A n 315 575 Quantitativer 1 r1 1 6 fr Y 1 39 0 5 path length difference a dsin6 d9 d yl I gt Viewing screen 2004 Thomson BrooksCole DoubleSlit Experiment Explained CI The experiment can be easily explained by interference Bright Dark constructive destructive interference interference lees Extra distance EXItfa dlstance l A A 2 l gt g f Screen Screen Ccpvrlghl 2m Femsou Eaunahw inc 9 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa m Constructive A 0 c 2n 4n Destructive A n 3x 515 DoubleSlit Experiment Explained gt Constructive A 03t 2n 4n or 2mm m012 22rd TSIH6ZMTE Igt Bright spots gt Destructive A4 Ic 3n 5n or 2m1 n m012 sin6 2m Dar gt H m r 39 Dark spots Physics 202 Lecture 13 Today s To ics I Sources ofthe Magnetic Field Ch 30 I Overview of Sources for Electric and Magnetic Fields I Magnetic Field Generated By Current I The BiotSavart La Gauss s Lawln Magnetism TheAmpere s Law I Magnetic eld around straight current I Preview Ch 3013 Sources of Eand 5 Fields An overview El Sources for the electric field Electric charges Coulomb39s Law static subjects of past several weeks Change of yield Faraday39s Law varying intime Thur day El Sources for the magnetic el Electric current BiotSavart LawIAmpere s Law today Change of E eldAmpereMaxwell Law o ay All these features are summarized in Maxwell Equations Demo Oersted s Effect Quick Quiz Magnetic Field And Current El Which figure represents the B field generated bythe currentI Quick Quiz Magnetic Field And Current El Which figure represents the B field generated bythe current 1 ExerciseDemo Magnetic Forces Between TWO Parallel Current Quiz What is the direction of the force on 12 TIPS Paallel cumnrs omocr each m AmiPcrallel cumms I39qu each other The BiotSavart Law El The BiotSavart Law gt integrated form gt Prope gt dais p gt dE0 if gt dB 11er erpendicular to d and nquot dsll r pa Aiixlo7 Tm A permeablll offree space Calculating B Field For A Given Current El Two approaches Direct superposition BiotSavart Law Applying Ampere s lawto sorne symmetric cases Recall Application of Gauss s lawror E Fields dime superposition Ampcn39 Law Later this lecture Exercise BGenerated by Current in a Straight Line in Text example 301 Showthat B at point Pi When the length of the wire is in nity Quiz In what direction Exercise Circular Current Loop D Text book 303 Show the B eld is Please exercisewlth the help of your TA Demo Bby Circular Current Loop 1 rV quot1 u Gauss s Law Of Magnetism DRecall Gauss s lawfor E eld f EIdAq39I 5n magnetic flux flan EldAlcosB D Notice that the right side of the equation is always en zero there is no magnetic c arg Ampere s Law El Ampere s Law it applies to any closed path it applies to any static B eld it is practically useful onl in symmetric cases I Ampere s Law can be derived from BiotSavart Law Magnetic Field Around In nite Straight Current 1 El UseAmpere s Law to Show that I 13 1 272R later in the lecture El Quiz direction ExerciseDemo Magnetic Forces Between TWO Parallel Current TIPS Parallel cumms unmet ml 0 ti AmiPaallel cumms I39qu each other

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