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\(\oint B . d A=0 \)
\(\oint B . d l=\mu_{o} I_{e n c} \)
\(J=\frac{I}{\pi R^{2}}=\frac{I_{e n c}}{\pi r^{2}} \)
\(B=\mu_{0} I \frac{r}{2 \pi R^{2}} \)
\(\begin{aligned} \oint B \cdot d l=& \mu_{o} I_{e n c} \\ &=\mu_{o}\left(I_{1}-I_{2}+I_{3}\right) \end{aligned} \)
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\(\oint B . d A=0 \)
\(\oint B . d l=\mu_{o} I_{e n c} \)
\(J=\frac{I}{\pi R^{2}}=\frac{I_{e n c}}{\pi r^{2}} \)
\(B=\mu_{0} I \frac{r}{2 \pi R^{2}} \)
\(\begin{aligned} \oint B \cdot d l=& \mu_{o} I_{e n c} \\ &=\mu_{o}\left(I_{1}-I_{2}+I_{3}\right) \end{aligned} \)
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