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l(f)ڣ[2009-3-15]    [3041]ΡЇ늚Ј(chng)ُW(wng)[EM39.com]{(bio)pԄ(dng)L}
     
(ni)FоͨľȦʹFһӾдԵbý늴F(electromagnet)ͨƳɗlλFоҪ״ŻʧԵܛF䓁@ӵ늴Fͨ늕r(sh)д늺S֮ʧ
(dng)ͨݾ܃(ni)FоFоͨݾܵĴň(chng)ŻŻFоҲ׃һ(g)w@ڃɂ(g)ň(chng)BĶʹݾܵĴԴ(qing)ʹ늴FĴԸ(qing)ͨFоƳҪעFоϾȦ@෴һ߅형r(sh)һ߅r(sh)@ͬɾȦ(du)FоĴŻÌ໥ʹFо@늴FFоܛFtһŻ󣬌L(zhng)ڱִԶ˴tԵď(qing)ͲĴСʧȥ늴F(yng)еă(yu)c(din)

(yu)c(din)
늴FS(yu)c(din)늴FԵПoͨԵĴСď(qing)Ȧє(sh)Ҳɸ׃СƴԴС

(yng)
늴FճИOVđ(yng) 늴FЧ(yng)ţһ(g)(yng)c“(lin)ϵo늴^늴ؙC(j)őҸ܇
늴FԷֱ֞늴Fͽ늴Fɴ;턝늴FҪɷֳN1늴FҪÁC(j)еb_P(gun)]NyTԈ(zh)Ԅ(dng)΄(w)2늴FbÁ\(yn)V䓲ġFɰFԲ3Ƅ(dng)늴FҪڌ(du)늄(dng)C(j)M(jn)Ƅ(dng)_(d)(zhn)_ͣ܇Ŀġ4Ԅ(dng)늴ϵy(tng)늴^ͽ|늴ϵy(tng)Ԅ(dng)_P(gun)늴Ó늴F5;늴Fĥ늴PԼ늴(dng)ȡ

늴FĚvʷ
꣬W(xu)Ұͅ_˰l(f)F(xin)(dng)ͨ^FK@r(sh)ʹ@еFKŻ@(sh)H늴Fԭl(f)F(xin)꣬˹ؽҲһƵČ(sh)(yn)һǴFģF@ˣȦ~㾀(dng)~c늳ؽͨr(sh)@ڣFϵ~Ȧa(chn)ܼĴň(chng)@ӾʹF׃һK늴F@N늴FϵĴҪܴŶ౶أFK(dng)ԴДFʲôFKҲס³ɞһͨF
˹ؽ늴Fl(f)ʹ˂˰D(zhun)ܵĹǰ@һl(f)ܿӢԼWһЩغ҂_
늌W(xu)Һ(du)˹ؽ늴FbM(jn)һЩ^(do)~(do)˲?f)?dn)ı~(do)^ֿ·ڌ(do)˽^ͿԌһȦȦؾoo@һھȦԽܼa(chn)Ĵň(chng)Խ(qing)@Ӿʹ˰D(zhun)ܵˣ꣬ԇƳһKµ늴FmȻwe𣱇صFK
늴Fİl(f)Ҳʹl(f)늙C(j)Ĺʵõ˺ܴ

늴Fň(chng)Д
늴FĴň(chng)ðඨtД
ඨtDZʾl(f)ň(chng)ĴŸоgP(gun)ϵĶtҲt
(1)ֱͨ(do)еİඨtඨtһסֱͨ(do)׌ĴָָķôָָǴŸоĭh(hun)@
(2)ͨݾеİඨtඨtסͨݾܣʹָcһôĴָָһͨݾܵNO
|(zh)
ֱİඨt(du)һСֱҲmáh(hun)ɿSСֱM(du)ÿһСֱֱİඨtжh(hun)SϴŸЏ(qing)ȵķB͵õh(hun)SϴŸоķֱİඨtǻh(hun)İඨtֱİඨt(do)ֱİඨt(du)늺ֱ\(yn)(dng)a(chn)Ĵň(chng)Ҳm@r(sh)c늺\(yn)(dng)ͬcؓ(f)늺\(yn)(dng)෴

ڊW˹Ч(yng)(sh)(yn)һϵЌ(sh)(yn)Ćl(f) J(rn)R(sh)ŬF(xin)ı|(zh) 漰 wĸN໥ÚwY(ji)֮g໥ˌԪ໥Ҏ(gu)ɵĻ}˿˷ԪoֱӜy(c)y ྫO(sh)Ӌ(j)4(g)ʾ㌍(sh)(yn)ԿbܵՓó˽Y(ji)ڰ(du)늴óֳ^ՓЏ(qing)˃Ԫ֮gBļO(sh)ţDʹY(ji)Փ`ʽǒe(cu)`BļO(sh)(jng)ĽY(ji)(yng)^c(din)飬Ԫa(chn)ň(chng)ň(chng)(du)еһԪʩ
x
ඨcஔ(dng)ǴõĻ(sh)(yn) Q˴ň(chng)|(zh)ṩӋ(j)໥õ;
ʽ
ԪI1d (du)12һԪI2d df12飺
0 I1I2d2 × (d1 × 12)
df12 =
4 123
ʽd1d2ķķ򣻦12ǏI1d ָI2d ďʸඨɿɷ֞ɲһԪIdɣI1d ڦã12̎a(chn)Ĵň(chng)
0 Id ×
dB =
4 3
@Ǯ-_-ɡԪIdlI2d2ڴň(chng)Bܵdfdf12飺
df = Id × B

dֻfϢվ^c(din)C(sh)ϢHD(zhun)dՈ(qng)ע̎




һƪ
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