锟斤拷锟斤拷锟斤拷锟斤拷锟絵目锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟教帮拷:锟斤拷(ch锟斤拷ng)锟斤拷(du锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷锟�

锟斤拷锟斤拷锟斤拷锟絥锟絩(sh锟斤拷)锟絞锟斤拷

锟斤拷锟斤拷锟斤拷锟絚(di锟斤拷n)要锟斤拷锟絚锟斤拷锟絰锟斤拷

锟斤拷锟斤拷1. 锟斤拷锟斤拷锟斤拷 锟斤拷锟斤拷锟斤拷锟侥凤拷锟斤拷 锟斤拷

锟斤拷锟斤拷2. 锟斤拷(qi锟斤拷ng)锟脚堬拷(ch锟斤拷ng)锟叫的帮拷锟斤拷锟斤拷 锟斤拷

锟斤拷锟斤拷锟斤拷锟紸(ch锟斤拷)知锟絉(sh锟斤拷)锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷一锟斤拷锟脚堬拷(ch锟斤拷ng)锟斤拷(du锟斤拷)通锟街憋拷锟�(d锟斤拷o)锟斤拷锟斤拷锟斤拷锟斤拷——锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷1锟斤拷锟斤拷小锟斤拷锟节勶拷(qi锟斤拷ng)锟脚堬拷(ch锟斤拷ng)锟斤拷锟斤拷锟斤拷(d锟斤拷ng)锟斤拷(d锟斤拷o)锟斤拷锟斤拷锟斤拷锟絚锟脚堬拷(ch锟斤拷ng)锟斤拷锟斤拷一锟铰時(sh锟斤拷)F锟斤拷= ;锟斤拷(d锟斤拷ng)锟斤拷(d锟斤拷o)锟斤拷锟斤拷锟斤拷锟絚锟脚堬拷(ch锟斤拷ng)锟斤拷直锟絩(sh锟斤拷)锟斤拷F(xi锟斤拷n)锟斤拷= 锟斤拷

锟斤拷锟斤拷2锟斤拷锟斤拷锟斤拷锟斤拷“ 锟斤拷锟絫”锟叫讹拷锟斤拷

锟斤拷锟斤拷3锟斤拷注锟解：F锟斤拷=BIL锟斤拷锟絤锟矫條锟斤拷锟斤拷锟斤拷一锟斤拷只锟絤锟斤拷锟节勶拷(qi锟斤拷ng)锟脚堬拷(ch锟斤拷ng);锟斤拷L⊥B;锟斤拷锟斤拷锟斤拷菑锟斤拷锟斤拷锟酵�電岋拷(d锟斤拷o)锟斤拷锟斤拷锟絫L锟斤拷指锟斤拷效锟絃(zh锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷锟节岋拷(d锟斤拷o)锟斤拷锟缴讹拷锟絚(di锟斤拷n)锟斤拷锟紹直锟斤拷锟斤拷锟絃(zh锟斤拷ng)锟斤拷(锟斤拷D锟斤拷示)锟斤拷锟斤拷锟斤拷(y锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絃锟斤拷始锟斤拷锟斤拷锟斤拷末锟斤拷.

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥戯拷(y锟斤拷ng)锟斤拷

锟斤拷锟斤拷(一)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絯锟斤拷锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng)锟斤拷锟斤拷锟斤拷袛锟�

锟斤拷锟斤拷1锟斤拷锟斤拷锟皆�锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫э拷锟斤拷锟街憋拷锟斤拷锟斤拷元锟斤拷锟斤拷锟斤拷锟斤拷锟街讹拷锟絫锟叫旓拷锟矫啃★拷锟斤拷锟斤拷元锟斤拷锟杰帮拷锟斤拷锟斤拷锟侥凤拷锟斤拷锟斤拷锟侥讹拷锟叫旓拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟杰猴拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絖锟斤拷锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng)锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷2锟斤拷锟斤拷锟斤拷位锟矫凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟紽锟紻(zhu锟斤拷n)锟斤拷一锟斤拷(g锟斤拷)锟斤拷锟节凤拷锟斤拷锟斤拷锟斤拷锟斤拷位锟矫猴拷锟斤拷锟叫斷安锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥讹拷锟絖锟斤拷锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng)锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷3锟斤拷锟斤拷效锟斤拷锟斤拷锟絟(hu锟斤拷n)锟斤拷锟斤拷锟斤拷锟酵�锟斤拷菥锟斤拷芏锟斤拷锟斤拷缘锟叫э拷蓷l锟轿达拷锟紽锟斤拷锟絣锟轿达拷锟紽也锟缴碉拷效锟缴環(hu锟斤拷n)锟斤拷锟斤拷锟斤拷锟酵�锟斤拷菥锟斤拷锟�锟斤拷通锟斤拷菥锟斤拷锟揭诧拷锟斤拷缘锟叫э拷珊芏锟斤拷训沫h(hu锟斤拷n)锟斤拷锟斤拷锟斤拷锟�(l锟斤拷i)锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷4锟斤拷锟斤拷锟矫結(ji锟斤拷)論锟斤拷锟斤拷锟劫冿拷锟斤拷锟斤拷嗷テ斤拷袝r(sh锟斤拷)锟給(w锟斤拷)锟紻(zhu锟斤拷n)锟斤拷(d锟斤拷ng)趨锟斤拷(sh锟斤拷)锟斤拷同锟斤拷锟斤拷锟斤拷嗷� ;锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷嗷� ;锟节冿拷锟斤拷锟斤拷锟狡斤拷袝r(sh锟斤拷)锟斤拷锟斤拷锟紻(zhu锟斤拷n)锟斤拷(d锟斤拷ng)锟斤拷锟洁互平锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟酵�锟斤拷趨锟斤拷(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟紷些锟結(ji锟斤拷)論锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟铰半功锟斤拷.

锟斤拷锟斤拷(锟斤拷).處锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷锟斤拷锟斤拷锟斤拷(w锟斤拷n)锟絵锟絩(sh锟斤拷)要注锟斤拷D锟轿碉拷變锟絈

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥凤拷锟斤拷锟角达拷直锟斤拷锟斤拷锟斤拷锟斤拷锟酵磁堬拷(ch锟斤拷ng)锟斤拷锟斤拷Q锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷直锟斤拷B锟斤拷I锟斤拷锟斤拷B锟斤拷I锟斤拷一锟斤拷锟斤拷直.锟斤拷锟絇(gu锟斤拷n)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷電綜锟斤拷锟絵锟斤拷锟斤拷锟芥及锟斤拷锟斤拷锟絊锟斤拷锟絯锟斤拷锟絞锟斤拷(w锟斤拷n)锟絵锟斤拷锟斤拷锟斤拷覀锟阶�?n锟斤拷i)锟斤拷S锟斤拷锟斤拷S锟斤拷锟阶冿拷y锟斤拷锟斤拷锟斤拷迅锟劫斤拷锟絵锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絵锟斤拷

锟斤拷锟斤拷1锟斤拷通電岋拷(d锟斤拷o)锟斤拷锟斤拷圈锟节帮拷锟斤拷锟斤拷锟斤拷锟斤拷小锟斤拷平锟斤拷(d锟斤拷ng)锟斤拷锟紻(zhu锟斤拷n)锟斤拷(d锟斤拷ng)锟斤拷(w锟斤拷n)

锟斤拷锟斤拷[锟斤拷1](1) 锟斤拷D锟斤拷锟斤拷锟絧锟絴(zh锟斤拷)锟斤拷圈锟矫硷拷(x锟斤拷)锟斤拷锟斤拷锟节达拷锟紽N锟絆锟斤拷锟斤拷锟斤拷锟斤拷锟紽锟斤拷锟絊锟斤拷锟斤拷锟絕(gu锟斤拷)锟斤拷圈锟侥圓锟斤拷锟揭达拷直锟节撅拷圈锟斤拷平锟斤拷锟斤拷锟斤拷(d锟斤拷ng)锟斤拷圈锟斤拷(n锟斤拷i)通锟絕(gu锟斤拷)锟紻示锟斤拷锟斤拷锟斤拷锟斤拷锟絩(sh锟斤拷)锟斤拷锟斤拷圈锟斤拷锟斤拷锟斤拷锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng)?_________________

锟斤拷锟斤拷(2)锟斤拷D锟斤拷示锟斤拷锟斤拷一锟斤拷锟絈直锟絃(zh锟斤拷ng)直通電岋拷(d锟斤拷o)锟斤拷锟斤拷一锟斤拷(g锟斤拷)通锟斤拷锟斤拷锟斤拷谓锟斤拷倏锟教庯拷锟酵�一平锟斤拷锟斤拷直锟斤拷(d锟斤拷o)锟斤拷锟斤拷ab平锟叫ｏ拷锟斤拷(d锟斤拷ng)锟絃(zh锟斤拷ng)直锟斤拷(d锟斤拷o)锟斤拷锟斤拷(n锟斤拷i)通锟斤拷锟斤拷锟较碉拷锟斤拷锟斤拷r(sh锟斤拷)锟斤拷锟斤拷锟斤拷計(j锟斤拷)锟斤拷锟斤拷锟斤拷锟絫锟斤拷锟斤拷锟轿斤拷锟劫匡拷軐锟斤拷锟�(hu锟斤拷)( )

锟斤拷锟斤拷A锟斤拷水平锟斤拷锟斤拷锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng) B锟斤拷水平锟斤拷锟斤拷锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng) C锟斤拷處锟斤拷锟給止?f锟斤拷n)锟紹(t锟斤拷i) D锟斤拷锟斤拷(hu锟斤拷)锟絣(f锟斤拷)锟斤拷锟紻(zhu锟斤拷n)锟斤拷(d锟斤拷ng)

锟斤拷锟斤拷[锟斤拷2] 锟斤拷一锟斤拷锟斤拷通電撅拷锟斤拷abcd,锟斤拷锟紷锟斤拷锟斤拷锟斤拷锟絊OO′锟紻(zhu锟斤拷n)锟斤拷(d锟斤拷ng),锟斤拷處锟斤拷锟絚OO′锟斤拷直锟侥勶拷(qi锟斤拷ng)锟脚堬拷(ch锟斤拷ng)锟斤拷(锟斤拷D).锟节磁堬拷(ch锟斤拷ng)锟斤拷锟斤拷锟铰撅拷锟斤拷锟絖(k锟斤拷i)始锟紻(zhu锟斤拷n)锟斤拷(d锟斤拷ng),锟斤拷锟斤拷o止锟斤拷平锟斤拷位锟斤拷.锟絫平锟斤拷锟�( )

锟斤拷锟斤拷A.锟斤拷锟斤拷锟斤拷邊锟斤拷锟斤拷锟杰磁堬拷(ch锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷.

锟斤拷锟斤拷B.锟斤拷锟斤拷锟斤拷邊锟杰碉拷指锟津線匡拷锟解部锟侥磁堬拷(ch锟斤拷ng)锟斤拷锟斤拷锟斤拷,锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷.

锟斤拷锟斤拷C.锟斤拷锟斤拷锟斤拷邊锟杰碉拷指锟津線匡拷锟�(n锟斤拷i)锟斤拷锟侥磁堬拷(ch锟斤拷ng)锟斤拷锟斤拷锟斤拷,锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷.

锟斤拷锟斤拷D.锟斤拷锟斤拷锟揭伙拷锟�(du锟斤拷)邊锟杰碉拷指锟津線匡拷锟解部锟侥磁堬拷(ch锟斤拷ng)锟斤拷锟斤拷锟斤拷,锟斤拷一锟斤拷(du锟斤拷)邊锟杰碉拷指锟津線匡拷锟�(n锟斤拷i)锟斤拷锟侥磁堬拷(ch锟斤拷ng)锟斤拷锟斤拷锟斤拷,锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷.

锟斤拷锟斤拷2锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絚锟侥勶拷(d锟斤拷ng)锟斤拷锟絎(xu锟斤拷)锟侥嗭拷(w锟斤拷n)锟絵

锟斤拷锟斤拷[锟斤拷3] 锟斤拷通電岋拷(d锟斤拷o)锟絯锟斤拷AC锟給止锟斤拷水平軌锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷m锟斤拷锟絃(zh锟斤拷ng)锟斤拷L(zh锟斤拷ng)锟斤拷通锟絕(gu锟斤拷)锟斤拷锟斤拷锟斤拷锟絀锟斤拷锟斤拷(qi锟斤拷ng)锟脚堬拷(ch锟斤拷ng)锟侥磁感忥拷(qi锟斤拷ng)锟饺烇拷B锟斤拷锟斤拷锟斤拷锟杰夛拷锟狡斤拷锟斤拷?锟角★拷锟斤拷軌锟斤拷锟杰碉拷AC锟斤拷锟侥夛拷锟斤拷锟斤拷摩锟斤拷锟斤拷锟斤拷锟斤拷锟�锟斤拷

锟斤拷锟斤拷[锟斤拷4]锟斤拷D锟斤拷示锟斤拷锟皆措妱锟�(d锟斤拷ng)锟斤拷(sh锟斤拷)E=2V锟斤拷锟斤拷(n锟斤拷i)锟斤拷r=0.5 Ω锟斤拷锟絈直锟斤拷(d锟斤拷o)軌锟斤拷锟斤拷锟皆猴拷锟皆诧拷計(j锟斤拷)锟斤拷锟斤拷锟劫帮拷锟斤拷锟絴(zh锟斤拷)锟斤拷m=0.1kg锟斤拷R=0.5Ω锟斤拷锟斤拷锟絚锟斤拷(d锟斤拷o)軌锟絞锟侥勶拷(d锟斤拷ng)摩锟斤拷锟斤拷(sh锟斤拷)μ=0.4锟斤拷锟斤拷效锟絃(zh锟斤拷ng)锟饺烇拷l=0.2m锟斤拷锟斤拷锟节岋拷(d锟斤拷o)軌锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷使锟斤拷锟劫帮拷锟斤拷锟斤拷锟斤拷(d锟斤拷ng)锟斤拷锟斤拷(y锟斤拷ng)锟斤拷一锟絚锟斤拷锟斤拷锟�30°锟絚锟斤拷锟斤拷直锟斤拷锟斤拷锟斤拷拇艌锟�(ch锟斤拷ng)锟斤拷锟斤拷(w锟斤拷n)锟斤拷

锟斤拷锟斤拷(1)锟剿磁堬拷(ch锟斤拷ng)锟斤拷斜锟斤拷锟斤拷還锟斤拷斜锟斤拷锟斤拷?

锟斤拷锟斤拷(2)B锟侥凤拷锟斤拷锟角讹拷锟斤拷?

锟斤拷锟斤拷[锟斤拷5]锟斤拷(g锟斤拷)锟杰讹拷ρ=9g/cm3锟斤拷锟組锟斤拷锟斤拷eS=10mm2锟侥斤拷锟劫環(hu锟斤拷n)锟斤拷處锟节忥拷锟斤拷?q锟斤拷)锟斤拷Q锟斤拷锟斤拷l(f锟斤拷)散锟侥磁堬拷(ch锟斤拷ng)锟斤拷锟斤拷锟絟(hu锟斤拷n)锟较革拷處锟侥磁感戯拷(y锟斤拷ng)锟斤拷(qi锟斤拷ng)锟饺烇拷B=0. 35 T锟斤拷锟斤拷锟节環(hu锟斤拷n)锟斤拷通锟斤拷順時(sh锟斤拷)锟�?l锟斤拷)锟斤拷?锟斤拷視)锟斤拷锟絀=10 A锟斤拷锟斤拷锟斤拷锟街★拷t=0. 2 s锟斤拷試锟斤拷锟斤拷锟斤拷锟絟(hu锟斤拷n)锟斤拷锟斤拷什么锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng)?锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng)锟侥撅拷锟絰锟角讹拷锟斤拷?(锟斤拷計(j锟斤拷)锟秸氾拷锟斤拷锟斤拷锟斤拷g= 10 m/s2)