$B$3$N5-;v$N85(B : $B1i=,$N1 $BLdBj$r2r$/$?$a$NJ*M}$N652J=q(B ($BEE<'5$(B) $B"+(B $BA0$N%Z!<%8(B $B!V(B 4. $B%3%s%G%s%5!<$H@EEE%(%M%k%.!<(B $B!W(B$B$KLa$k(B

• 5.1 $B<'@P$NNO$r@8$`$b$N(B
• 5.2 $BEEN.$,$"$k$H$-$N<'>l$N5a$aJ}(B1 ($B%"%s%Z!<%k$NK!B'(B)
• 5.3 *$BLdBjN}=,(B
• 5.4 *$BLdBjN}=,(B2

5. $B<'B+L)EY(B($B%"%s%Z!<%k$NK!B'(B)

$B$3$3$^$G$OEE>l$dEE2Y$J$I!VEE5$$NNO!W$K4X$9$kOC$r$7$F$-$^$7$?!#(B $B$=$3$G:#2s$OEE<'5$3X$N$b$&0l$D$NBP>]$G$"$k!V<'@P$NNO!W$K$D$$$F9M$($F$$$-(B $B$^$7$g$&!#(B

5.1 $B<'@P$NNO$r@8$`$b$N(B

$B<'@P$NNO(B ---$B!V<'NO!W$K$D$$$F$O!"4pK\E*$K$OEE5$$NNO$HF1$8$h$&$K9M$($^$9!#(B $B$D$^$j!"$^$:<'@P$NNO$rF/$+$;$kG=NO$,$I$l$@$1$"$k$+$r<($9NL$H$7$F!V<'2Y!W(B $B$H$$$&NL$r9M$($^$9!#$=$7$F6u4V$NCf$K<'2Y$,B8:_$7$F$$$k$H!"$=$N<~$j$K$O(B $B!V<'>l!W$H$$$&$b$N$,H/@8$7$F$$$k$H9M$($^$9!#(B $B$=$7$F<'2Y$KF/$/NO$H$$$&$N$O!"$=$N<'2Y$,B8:_$7$F$$$k0LCV$N<'>l$K<'2Y$NBg(B $B$-$5$r3]$1$?$b$N$H$7$F5a$a$^$9!#(B

$B$3$N$h$&$KOC$9$H!"<'@P$NNO$K$D$$$F$O$b$&3X$V$3$H$O$J$$$s$8$c$J$$$+$H;W$&(B $B$+$bCN$l$^$;$s$,!"EE5$$NNO$H$OBg$-$/0c$&E@$b$"$j$^$9!#(B $B$=$l$O$J$K$+$H$$$&$H!VC10L<'2Y$OB8:_$7$J$$!W$H$$$&$3$H$G$9!#(B $B$o$+$j$d$9$$8@$$J}$r$9$k$H!V<'@P$OI,$:(BN$B6K$H(BS$B6K$,BP$K$J$C$FB8:_$7$F$$$k!W(B $B$H$$$&$3$H$G$9!#(B

$B$J$<$3$N$h$&$J@-l$rH/@8$5$;$k!W(B $B$H@bL@$7$^$7$?$,!"$3$N$3$H$,@5$7$/$J$$$N$G$9!#(B $B@5$7$/$O(B $B!V$3$N@$$NCf$K<'2Y$H$$$&$b$N$OB8:_$;$:!"EE2Y$,6u4VCf$r0\F0$7$?$H$-$K<'>l(B $B$,H/@8$9$k!W$N$G$9(B ^5.1$B!#(B

$BEE2Y$,6u4VCf$rF0$/$H$$$&$N$O!"$=$3$K!VEEN.$,N.$l$?!W$HI=8=$G$-$^$9!#$D$^(B $B$jEEN.$,N.$l$k$H$=$N<~0O$K<'>l$,H/@8$9$k$h!D$H$$$&$N$,!">e$K=q$$$?FbMF$J(B $B$N$G$9!#(B

$B$=$l$8$c$"<'@P$H$O$$$C$?$$2?$J$N$+(B?$B$H;W$&$+$b$7$l$^$;$s!#(B $BJ,$K3d$C$?$H$-$K!V(BN$B6K$@$1!W$N2t$H(B $B!V(BS$B6K$@$1!W$N2t$r:n$k$3$H$,$G$-$k$O$:$G$9!#(B $B$@$1$I $B$I$&$7$F$3$&$J$k$+9M$($F$_$^$7$g$&!#<'@P$r(B $B8B3&$^$G@i@Z$C$?$H$7$^$9!#$9$k$H86;R$,=P$F$/$k$O$:$G$9!#$=$N86;R$NCf$K$O(B $BEE;R$,$"$j!"86;R$NCf$r$0$k$0$k2s$C$F$$$^$9!#(B $BEE;R$,$0$k$0$k2s$C$F$$$k!D$H$$$&$3$H$O!"EEN.$,N.$l$F$$$k$H8+$J$9$3$H$,$G(B $B$-$^$9!#$=$7$F$=$N<~0O$K<'>l$rH/@8$5$;$k$3$H$K$J$j$^$9!#(B $BEEN.$,H/@8$5$;$k<'>l$H$$$&$N$OC10L<'2Y$,$D$/$k<'>l$H$O0c$$!"(BN$B6K$H(BS$B6K$,BP(B $B$K$J$C$?$h$&$J<'>l$G$9!#$=$N$?$a!"<'@P$O$I$3$^$GJ,2r$7$F$b(BN$B6K$H(BS$B6K$,BP$K(B $B$J$C$F8=$l$k$N$G$9!#(B $B$3$l$,<'@P$N@5BN$J$N$G$9(B ^5.2$B!#(B

$B$=$N$h$&$J:Y$+$$EEN.$G$J$/!"L\$K8+$($k$/$i$$$NHO0O$rEE2Y$,F0$$$?(B(=$BEEN.$,(B $BN.$l$?(B)$B$H$7$F$b!"$=$N<~0O$K<'>l$,H/@8$7$^$9!#(B $B$=$7$FH/@8$7$?<'>l$O!"<'@P$dEEN.$K:nMQ$7$F!"NO$rF/$+$;$k$H$$$&$o$1$G$9!#(B

$B$5$F(B $B$3$N$3$H$rF'$^$($F!"$I$l$/$i$$$NEEN.$,N.$l$?$i$I$l$/$i$$$N<'>l$,H/@8$9$k(B $B$N$+$H$$$&$3$H$r9M$($F$$$-$^$7$g$&!#(B

5.2 $BEEN.$,$"$k$H$-$N<'>l$N5a$aJ}(B1 ($B%"%s%Z!<%k$NK!B'(B)

$BEE5$$K$D$$$F$N5DO@$r;W$$=P$7$F$_$^$7$g$&!#(B $BEE5$$NNO$G$O!"6u4VCf$KEE2Y$,$"$k$H$=$N<~0O$KEE>l$rH/@8$5$;$^$7$?!#$I$l$/(B $B$i$$$NEE2Y$,$"$k$H$I$l$/$i$$$NEE>l$,H/@8$9$k$+!"$H$$$&4X78$r!V%,%&%9$NK!(B $BB'!W$,<($7$F$$$^$7$?!#(B $B:#EY$O<'@P$NNO$K$D$$$F!"!V%,%&%9$NK!B'!W$KBP1~$9$kK!B'$r9M$($F$$$-$^$7$g(B $B$&!#(B

$B6u4VCf$K$"$kEEN.$H!"$=$N<~0O$K$G$-$k<'>l$H$N4X78$r<($9K!B'$N$3$H$r!V%"%s(B $B%Z!<%k$NK!B'!W$H8F$S$^$9!#(B $B$=$NFbMF$O!"$$$-$J$j<0$G=q$$$F$7$^$&$3$H$K$7$^$7$g$&!#$3$&$G$9!#(B

$B%"%s%Z!<%k$NK!B'!'<'>l$HEEN.$N4V$K@.$jN)$D4X78<0(B

$$\ensuremath{\mbox{rot}}\vec{B}=\mu_0 \vec{i}$$

$B$$$-$J$j5-9f$,8=$l$F$$$^$9$,!"(B

$$\left\{ \begin{array}{ccl} \vec{B}& : & \text{$B<'>l(B} \\ \vec{i}& : & \text{$BEEN.L)EY(B} \\ \end{array}\right.$$

$B$H$$$&$b$N$G$9!#(B$\vec{B}$$B$N$3$H!"652J=q$K$h$C$F$O!V<'B+L)EY!W$H8F$s$G$$$^$9!#Nr;KE*$K$O3N$+$K!V<'B+L)EY!W$HL>IU$1$i$l$?$s$G$9$,!"l!W$H8F$V$Y$-$b$N$@$H;W$$$^$9$N$G!"$3$3$G$O!V<'>l!W$H=q$$$F$*$-$^$9!#(B $\vec{i}$$B$OC10LLL@Q$"$?$j$I$l$@$1$NEEN.$,N.$l$F$$$k$+!"$=$NNL$HJ}8~$r<($9$b$N$G$9!#(B$\mu_0$$B$O??6u$NF)<'N(!DE,Ev$JDj?t$@$H;W$C$F7k9=$G$9!#(B

$B$5$F!"$3$N$h$&$K=q$$$F$_$?$b$N$N!"$I$&$b(B $\ensuremath{\mbox{rot}}\vec{B}=\mu_0 \vec{i}$$B$H$$$&$N$O0UL#$,$o$+$j$K$/$$$G$9$h$M!#(B $BEE5$$N2s$K$*OC$7$7$?%,%&%9$NK!B'$N$h$&$K!"$3$N%"%s%Z!<%k$NK!B'$K$b!V@QJ,7A!W$H8F$P$l$k7A$,$"$j$^$9!#$=$A$i$K<0$rJQ7A$7$F$7$^$$$^$7$g$&!#(B

$$\ensuremath{\mbox{rot}}\vec{B}=\mu_0 \vec{i}$$

$$\downarrow \qquad$$

$$\downarrow \qquad$$ ($B@QJ,7A$G=q$/$H(B)

$$\downarrow \qquad$$

$$\oint_{C}\vec{B}\cdot d\vec{\ell} = \mu_0 \int_{A} \vec{i}\cdot d\vec{S}$$

$B$H$J$C$F!"$3$N:G8e$N<0$,!V@QJ,7A$N%"%s%Z!<%k$NK!B'!W$H8F$P$l$k$b$N$G$9!#(B $B$3$N<0JQ7A$N2aDx$G$O!H%9%H!<%/%9$NDjM}!I$H$$$&?t3X$N%F%/%K%C%/$r;H$C$FJQ7A$7$^$9!#:#F|$O$d$j$^$;$s$,!"$=$l$[$IFq$7$$OC$G$O$"$j$^$;$s!#JQ7A$NESCf$K6=L#$r;}$C$??M$O!"652J=q$GJY6/$7$F$_$F$/$@$5$$!#(B

$B:#F|$N1i=,$G$O!"$3$N@QJ,7A$N%"%s%Z!<%k$NK!B'$r$I$&;H$C$FLdBj$r2r$/$+$C$F$3$H$r@bL@$7$^$9!#(B $B$5$F!">e$G$O$$$-$J$j5-9f$rF3F~$7$F$$$^$9$,!"(B$A$$B$H$+(B$C$$B$H$$$&$N$O(B

$$\left( \begin{array}{ccl} A &:& \text{$BG$0U$NNN0h(B($BLL(B)} \\ C &:& \text{$BNN0h(B$A$$B$N<~0O(B} \\ \end{array}\right)$$

$B$G$9!#(B

$B$3$N@QJ,7A$N%"%s%Z!<%k$NK!B'$r!"%,%&%9$NK!B'$N$H$-$HF1$8$/F|K\8lLu$7$F$7$^$$$^$7$g$&!#$3$NK!B'$O!"<'>l$HEEN.$N4V$K@.$jN)$D4X78$r<($7$F$$$k$N$G$9$,!"(B

$B%"%s%Z!<%k$NK!B'$N0UL#(B($BF|K\8lLu(B?):

$$\left( \begin{array}{l} \text{$\vec{B}$$B$r$$e(B} \\ \tex... ...$B=$N@~$G0O$^$l$?LL$r2#@Z$k}(B\\ \text{$BEEN.$r$9$Y$FB-$7$?$b$N(B} \end{array}\right) $">

$B$H$$$&4X78$K$J$C$F$$$^$9!#(B($\mu_0$$B$O$3$NN>JU$,%$%3!<%k$K$J$k$?$a$NDTjm9g$o$;$N?t$@$H9M$($F$b9=$$$^$;$s(B) $B<'>l$HEEN.$N4V$K$O!">o$K$I$s$J$H$-$G$b!"$3$N4X78<0$,@.$jN)$C$F$$$^$9!#(B $B$=$7$F!"(B

$\rightarrow$ $B$3$N4X78<0$+$i!"(B($BFCDj$N>l9g$K(B) $B<'>l$r3Z$K7W;;$G$-$k!#(B

$B$H$$$&$o$1$G$9!#(B

$B$3$N@QJ,7A$N%"%s%Z!<%k$NK!B'$G$I$s$J$H$-$G$b<'>l$r5a$a$k$3$H$,$G$-$k$+$H$$$&$H!"$=$&$$$&$o$1$G$O$"$j$^$;$s!#%,%&%9$NK!B'$OFCDj$N>l9g$K8B$C$F4JC1$K7W;;$,$G$-$?!D$H$$$&$N$HF1$8$/!"%"%s%Z!<%k$NK!B'$OFCDj$N>l9g$K8B$C$F!"4JC1$K<'>l$r7W;;$9$k$3$H$,$G$-$^$9!#(B($BFCDj$N>l9g$G$J$/!"<'>l$r5a$a$?$$$H$-$O!"%S%*!&%5%P!<%k$NK!B'$r;H$$$^$9!#$=$l$K$D$$$F$O8e$N $B$5$F!"$=$l$G$O$I$s$J>l9g$K;H$($k$N$+!D$C$F$3$H$b9M$($J$,$i!"$3$N@QJ,7A$N%"%s%Z!<%k$NK!B'$N;H$$J}$r8+$F$$$-$^$7$g$&!#$3$N;H$$J}!"%,%&%9$NK!B'$N$H$-$H$[$H$s$IF1$8$G$9!#(B

$B%"%s%Z!<%k$NK!B'$NN>JU$rD/$a$F$_$k$H!":8JU$OJD$8$?6J@~>e$G@~@QJ,$r$7$J$1$l$P$J$j$^$;$s!#1&JU$O!"LL$r2#@Z$kEEN.$rB-$7;;$9$k$@$1$G$9!#$I$A$i$bF1$8$/$i$$Lq2p$K$J$j$=$&$G$9$,!D$I$A$i$+$H$$$&$H!"@~@QJ,$NJ}$,BgJQ$K$J$j$d$9$=$&$G$9!#$=$3$G%]%$%s%H$O!=!=(B

$$\begin{array}{\vert c\vert}\hline $B;H$$J}(B \\ \hline \end{array}$$ : $B@~@QJ,$7$d$9$$6J@~$r8+$D$1$k(B

$B$H$$$&$3$H$K$J$j$^$9!#(B

$B$I$s$J6J@~$@$H@~@QJ,$7$d$9$$$+$H$$$&$H!"<'>l$NBg$-$5(B$\vert\vec{B}\vert$$B$,Ey$7$/$J$k$h$&$J@~>e$G$9!#$=$&$G$J$1$l$P!"@QJ,$9$k$=$l$>$l$N0LCV$K$h$C$F(B$\vec{B}$$B$NBg$-$5$dJ}8~$r0U<1$7$FB-$7;;$7$J$$$H$$$1$^$;$s!#$@$1$I;O$a$+$i<'>l$NBg$-$5$,Ey$7$/$J$k$h$&$J@~$G@QJ,$9$k$3$H$K$7$F$*$1$P(B$\vert\vec{B}\vert$$B$r@QJ,$N30$K=P$9$3$H$,$G$-$^$9$M!#(B

$B$=$N$?$a$K$O$^$:(B

$$\begin{array}{\vert c\vert}\hline $B;H$$J}(B \\ \hline \end{array}$$ : $B@~@QJ,$7$d$9$$6J@~$r8+$D$1$k(B

1. $B<'>l$N$*$h$=$N7A$rM=A[$9$k!#(B

$B$H$$$&$3$H$,I,MW$G$9$M!#(B $B$=$NM=A[$,$G$-$?$i!"(B

$$\begin{array}{\vert c\vert}\hline $B;H$$J}(B \\ \hline \end{array}$$ : $B@~@QJ,$7$d$9$$6J@~$r8+$D$1$k(B

1. $B<'>l$N$*$h$=$N7A$rM=A[$9$k!#(B
2. $B<'>l$NBg$-$5$,F1$8$G$"$k$h$&$J6J@~$G(B1$B<~$5$;$k!#$=$N$H$-EEN.$,B8:_$9$kNN0h$,@~$G0O$^$l$k$h$&$K$9$k!#(B $B$=$N0O$^$l$?ItJ,$,NN0h(B$A$$B!#(B
3. $B%"%s%Z!<%k$NK!B'$rE,MQ$7$F!"(B$\vert\vec{B}\vert$$B$r5a$a$k!#(B
   $B!!(B($\vec{B}$$B$NJ}8~$K$D$$$F$OM=A[$9$k(B)

$B$H$$$&N.$l$K$J$j$^$9!#(B

$B$5$F!V<'>l$N$*$h$=$N7A$J$s$+$o$+$i$J$$$h!W$H$$$&>l9g$O$I$&$7$^$7$g$&$+(B? $B!D$3$NEz$($O%,%&%9$NK!B'$N$H$-$HF1$8$G$9!#!V$=$N$h$&$J>l9g$O!"%"%s%Z!<%k(B $B$NK!B'$G3Z$K7W;;$O$G$-$^$;$s!#:#EY!"$*OC$7$9$k%S%*!&%5%P!<%k$NK!B'$r;H$C(B $B$F<'>l$r5a$a$F$/$@$5$$!W(B

$B$=$l$G$O!"OC$rJ9$$$F$$$k$@$1$G$O$h$/$o$+$i$J$$$G$7$g$&$+$i!"6qBNE*$KLdBj(B $B$r2r$$$F$$$C$F$_$^$7$g$&!#(B

5.3 *$BLdBjN}=,(B

$BLdBj(B22 (Ampère$B$NK!B'(B / $z$$B<4$NF3@~$,$D$/$k<'>l(B)

$B86E@$rDL$j!"(B$z$$B<4J}8~$KL58B$KD9$$F3@~$,$"$k!#$=$NF3@~$KBg$-$5(B$I$$B$NEEN.$r(B $BN.$7$?!#(B($BF3@~$N8|$_$OL5;k$7$F$h$$(B)

(1) $B$=$NEEN.$N8~$-$r(B$z$$B<4@5$NJ}8~$H$7$F!"F3@~$N2s$j$K$G$-$k<'>l$NMM;R$r?^(B $B<($;$h!#(B

(2) (1) $B$N9M;!$N$b$H!"%"%s%Z!<%k$NK!B'$rMQ$$$F!"F3@~$N2s$j(B $B$K$G$-$k<'>l(B($B<'B+L)EY(B)$\vec{B}$$B$r!"(B$z$$B<4$+$i$N5wN%(B$r$$B$rJQ?t$K$H$C$FI=$;!#(B

$B!v!v(B
$B!v(B
$B!v(B

$BD>@~EEN.$,$I$s$J7A$N<'>l$r$D$/$k$N$+(B1$BEY$bJ9$$$?$3$H$,$J$$?M$O!"7A$rM=A[(B $B$7$m$C$?$C$F$5$C$Q$j$o$+$i$J$$$h(B!$B$H;W$C$F$$$=$&$G$9$M!#(B $BD>@~EEN.$,$"$k$H!"$=$NEEN.$rCf?4<4$H$9$k1_>e$K<'>l$,H/@8$7$^$9!#(B

$B$J$<$=$&$J$k$N$+$H$$$&$H!D$3$l$O

$BEEN.$N8~$-$r%M%8$,?J$`J}8~$H$7$F!"1&%M%8$r2s$9J}8~$,<'>l$N8~$-$H0lCW$7$^$9!#(B

$B!!(B
$B!v(B
$B!v(B $B!v(B $B!v(B

$BLdBj(B23 (Ampère$B$NK!B'(B / $BL58B$KD9$$%3%$%k$,$D$/$k<'>l(B)

$BC10LD9$5$"$?$j$N4,$-?t$,(B$n$$B2s$G$"$k%3%$%k$KEEN.(B$I$$B$rN.$7$?!#$3$N%3%$%k$OL58B$KD9$$$H8+$J$;$k$H$7$F!"%3%$%kFb$N<'>l(B($B<'B+L)EY(B)$B$N6/$5(B$\vert\vec{B}\vert$$B$r5a$a$h!#(B

$B!v!v(B
$B!v(B
$B!v(B

$B%"%s%Z!<%k$NK!B'$r;H$C$F<'>l$r5a$a$kE57?E*$J%Q%?!<%s$N0l$D$G$9$,!"=i$a$F(B $B$3$NLdBj$KD)@o$9$k?M$O!"$I$s$J6J@~$GEEN.$r0O$a$P$$$$$N$+$o$+$j$K$/$$$H;W(B $B$$$^$9!#(B

$B<'>l$N@~@QJ,$,7W;;$7$d$9$$@~$rA*$Y$P$$$$$o$1$G$9!#$J$N$G<'>l$NBg$-$5$,(B $B0lDj$K$J$k@~$@$1$G$J$/!"@~$H<'>l$N8~$-$,D>8r$7$F$$$k$h$&$J@~J,$b!"@QJ,(B $BNN0h$K2C$($F$7$^$$$^$7$g$&!#@~$H<'>l$N8~$-$,D>8r$7$F$$$k$H$$$&$3$H$O!"(B $B@~@QJ,(B $\int \vec{B}\cdot d\vec{\ell}$$B$K$*$$$F!"(B$\vec{B}$$B$H(B $d\vec{\ell}$ $B$,D>8r$7$F$$$k$H$$$&$3$H!#Fb@Q$,(B0$B$K$J$j$^$9!#!D(B0$B$r@QJ,$7$F$b!"(B0$B$N$^$^(B $B$@$+$i!"@QJ,$7$d$9$$$G$9$M!#(B

$B!!(B
$B!v(B
$B!v(B $B!v(B $B!v(B

$BLdBj(B24 (Ampère$B$NK!B'(B / $B8|$_$N$"$kF3@~$N$D$/$k<'>l(B)

$BH>7B(B$R$$B$N1_Cl>u$NF3@~$,$"$k!#$3$NF3@~$KBg$-$5(B$I$$B$NEEN.$rN.$9!#(B

$B$3$NF3@~$OL58B$KD9$$$b$N$H$7$F!"$5$i$KF3@~Fb$G$OEEN.$O0lMM$KN.$l$k$b$N$H$9$k!#(B

(1) $BF3@~Fb$NEEN.L)EY(B$i$($BC10LCGLL@Q$"$?$j$rN.$l$kEEN.$NBg$-$5$N$3$H(B)$B$r5a$a$h!#(B

(2) $B1_Cl$NCf?4$+$i$N5wN%$r(B$r$$B$H$7$F!"$3$NEEN.$K$h$C$F@8$8$k<'>l(B($B<'B+L)EY(B) $B$NBg$-$5(B$\vert\vec{B}\vert$$B$r(B$r$$B$N4X?t$H$7$FI=$;!#(B

(3) $B2#<4$K(B$r$$B$r$H$C$F!"(B$\vert\vec{B}\vert$$B$N%0%i%U$rIA$1!#(B

$B!v!v(B
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