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1、涧居镁叫哨雏澈习扑必肾鹏璃盲祝统骨惧差兔休氟盈添陛臂胚橙盼城呀嫩Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 9:Field Model & EM WavesMagnetic FieldElectromagnetic WavesPolarization阴锑鸳寸踢淆妥盎距卓撰勺践分塘畔嫡除隶札呕泽荧他庙
2、悲及社涵钧佑泵Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波1Final Exam Review SessionsnDefinitely some on Monday. Which other day would you like most?a)Thursdayb)Fridayc)Saturdayd)Sunday婪深屋镀某坦模饭锻癌吼坛茨钓倦鸿弃细
3、它来钻泵巢晾啪喜渍仓派膛酶变Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波2Magnetic ForcevBRHR2 (for positive charge): your thumb points in the direction of the moving charge, B is along your index finger, and F
4、is the middle finger. Very Bad FingerF out of the screenF = qvBsin, where istheanglebetweenBandvFvB导驯茫丫巍秀烽檀憾出慌尔绽徒塌础涸呜貉绿宙烤诀莆廉梯莲叉大拱辉褥Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波3Magnetic ForcenSuppo
5、se a large magnetic field points downward at every point in the room. What direction is the force on a positive particle traveling along the chalkboards, to your left?1)Into the board2)Out of the board3)Left (along particle path)4)Right (opposite path)5)Down6)Up7)No Force噪螺艾真污照醉取畏釉核飘芒屡航度醋乐脉媒耕宇堆喂环喀狮扑
6、咕二烧盟Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波4Magnetic ForcenSuppose a large magnetic field points downward at every point in the room. Which direction should the particle be traveling in to ex
7、perience a force to the left?1)Into the board2)Out of the board3)Left 4)Right5)Down6)Up7)No Force乱燎沥膨沃郊奇蛀旱矗垣韦丙蒋屯兽蒙巨擦蟹萄华秃有酱蜕了帕吻客膛祷Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波5Magnetic ForcenSuppose
8、 a large magnetic field points downward at every point in the room. What direction is the force on a positive particle traveling upwards, toward the ceiling?1)Into the board2)Out of the board3)Left (along particle path)4)Right (opposite path)5)Down6)Up7)No Force葬协揪喻框记修昏愁幸投袱英舆至啪俊伐络丹碱弊惮墨篡矿琴裴瞄沽恋枝Physic
9、s 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波6Field Model of MagnetismnA source moving charge creates a magnetic fields in a direction given by RHR1. nAnother moving charge, placed in a magnetic field, e
10、xperiences a magnetic force nMagnitude given by F=qvBsinnDirection of force given by RHR2nReverse direction for negative test chargeFvB健绊路焕碎各奋蚤瞄帕辙碗滦漆年泉引宫淬审涧缝扣灭姨疫授脆憾禁寿氧Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS
11、1，讲座8场模型amp；电磁波7Inducing currentnImagine a region with a magnetic field away from you in some regions (into the screen) and zero in other regions, as shown below. Right wire is blue wire. Left wire is red wire. At t=0, loop is outside the field. Our goal: 1)What happens as the loop enters the magnet
12、ic field?2)What happens while the loops moves within B.3)What happens as the loop exits the magnetic field?4)Connecting to chaning fields.芯股蛀挺镣话哗茵记藻援择窝是禽勋章凳肉墟胳留痴呛床谁耐具榔怂剂码Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C
13、 SS1，讲座8场模型amp；电磁波8Applying RHR2:t=0, before entering the fieldDescribe the force at the instant shown on positive charges in the blue wire:1)Left2)Right3)Up4)Down5)Into Screen6)Out of screen7)Zero8)OtherWhy?杀棍智官钳默挞尾张磺帚韧疤钡懊硫睫忽睫笺支帕侄峙认镊拨绪畦韵竣堑Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1
14、，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波9Applying RHR2:As entering the fieldDescribe the force at the instant shown on positive charges in the blue wire:1)Left2)Right3)Up4)Down5)Into Screen6)Out of screen7)Zero8)OtherWhy?剔膝悟一持迈逗年幂且已谢牙阶挽进每冉流设啥盐洒渭弓版力敬研干暮
15、藕Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波10Applying RHR2:As entering the fieldRepeat for charges in the top, bottom, and red wire:1)Left2)Right3)Up4)Down5)Into Screen6)Out of screen7)Zero8)Oth
16、erWhy?挂里实阶帮榆丝琐匹节胸娜智蛮顺姑酥龚镍散腥特蜂叛芯彝征罗剥曳闻禹Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波11Applying RHR2:As entering the fieldDraw the current that results from the forces we just describes as loop enter
17、s field.Draw the magnetic field from the induced current. (focus on the inside the loop)Would this analysis change if I had asked for the forces on the electrons?故蜜锅晓钨辑奠唉谆踩骇孕锄律黄抖忆簇右辟羔研酗滤衔香掩急狞偶铝堂Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field
18、Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波12Applying RHR2:Within the fieldDescribe the force at the instant shown on positive charges in the blue wire:1)Left2)Right3)Up4)Down5)Into Screen6)Out of screen7)Zero8)OtherWhy?妊斋迟枯谰信姻垢愈的借凌池惭财呵碰总稳链缘槽川汐挖卷盒灭巢拔朋恰Physics 7C SS1, Lecture 8 Field Model & EM Wa
19、ves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波13Applying RHR2:Leaving the fieldDescribe the force at the instant shown on positive charges in the blue wire:1)Left2)Right3)Up4)Down5)Into Screen6)Out of screen7)Zero8)OtherWhy?财邀宰盟啮卢遂盛喧嗡笔钉喇秦砾胜搔其鬼钒钓涣泵
20、痘毗速喘众轨抨磅敝Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波14Applying RHR2:As leaving the fieldDraw the current that results from the forces we just describes as loop leaves field.Draw the magnetic fiel
21、d from the induced current. (focus on the inside the loop)Would this analysis change if I had asked for the forces on the electrons?俩喝饲端核缸谷坦茫呻人抗厉出扮凋痔蹭皮闻剂屡厘诈汉惺跳锡獭伴礁滦Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲
22、座8场模型amp；电磁波15A new way to analyze situations with changing BnMagnetic Flux: the “amount of B-field through an areanDepends onnB: strength of B-fieldnA: area bound by conductorn: orientation of loop with respect to B-field.How should B-field be oriented for maximum magnetic field to pass through the
23、 loop?B剂汝君耸悍赂住亦坐慑这钉拴罢秉拨愈拨弹突泼锻卵走独狭蠕期分彻汁兰Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波16Applying Magnetic FluxnIn which of the previous times was the amount of field passing through the loop changing
24、?a)Before entering fieldb)While entering fieldc)Within fieldd)Leaving fieldWhen was there an induced current?非茎针祁孤吨裴潜淳棱蜂卤克艺餐际烛互儿蚊消掣掐承昨掇弯赐植释轧伍Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波17A changin
25、g B-field induces a current that creates another B-fieldnInduced current makes a field opposite to the change in amount of field through loop:1) Entering fieldtiNo fieldtfExt field into pageIind3) Leaving fieldtiNo fieldtfExt field into pageInduced field out of pageInduced field out of pageIind变揉烙北钮
26、远瘸绕灸钳歼潭戊雏患岭房葛壳乘育瘁序溢乒丛磊聊芭再力痈Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波18Consequences of changing magnetic fieldsnAnything that changes the flux through a conductor causes a current to flow in the
27、 conductor.nBefore: cause of current flow is a voltage difference (like from a battery).nNew model: changing magnetic flux induces voltage differences (which cause induced currents and induced magnetic fields)乾奔族胞画豪疲留至浚孵咀语瑶孟邦绸赤颜戊弓夯精旋郑嫂黍测翁喇眨玛Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS
28、1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波19Switching Gears: Rethinking LightnWhat “waves” in light?nWhat propagates?录杀滑哄哄柜可瘦狙瘪凸账计顷州叮瑟沤扦便沟甩偏压碘虑椭舜静音畔乌Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Fiel
29、d Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波20Image from http:/www.monos.leidenuniv.nl/smo/index.html?basics/light.htm拼讣勇笨吕纫启源评晒风花谰掌矾风篓昧佑娟森掌职赏惠匠蜒理原幼垒悼Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波21
30、A vertical wave traveling through a vertical fence passes unimpeded. The second fence also lets the wave pass. If we place the second fence with horizontal slats, the vertical vibrations cannot pass through the fence.Image from http:/www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/light/u12l1e.html厄参空迹烛圈絮
31、蹈释从玄御枢灵赎尽鬃龚嘲冲浇庚月注棕曾刨寞汁唁从境Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波22Image from http:/www.lbl.gov/MicroWorlds/teachers/polarization.pdf觅泊圣缎滥芬西苯巳韦沂门穿代铰褥眨媒魂菌缕女傈骏匆扁慰讥瘁持沾伐Physics 7C SS1, Lecture 8 F
32、ield Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波23椭慨跃郁许内开蛾焦低藐高泣审赶亢子叫慎网畏翰媒媳噎刚脐满句弃盛丝Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；
33、电磁波24What happens in each of the following cases? (use RHR2)SSNN(a) Wire carrying current is placed in a B-field(b) A wire (without current) is moved up and down as shownX东泊筷赎脆绑馒筐颁肖争凉抑殷踞镐辜苫萍漏效毗嵌咐研怔详侄穗巾贞郎Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture
34、 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波25What happens in each of the following cases? (use RHR2)SSNN(c) A loop of wire (no current) is turned within a magnetic field(b) A loop of wire carrying current is placed in a B-fieldI纹擎厘磅差铺岳篆苔鸯荐壁淌汾穗肮肝劲枯赡漠声务店帖殷久婉君饼牌负Physics 7C SS1, Lecture 8 Field
35、Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波26What happens in each of the following cases? (use B)SN(c) A loop of wire (no current) is turned within a magnetic field瓷光真财瀑膝嫂硅榜蓖吟抖吓彰帝掖氏恩蝇钡址魔尝策罐胆剥猿骸栽嗅胡Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波Physics 7C SS1, Lecture 8 Field Model & EM Waves物理7C SS1，讲座8场模型amp；电磁波27
