Magnetic Effects of Electriuc Current
Ampere’s circuital law
 The line integral of magnetic field induction $\overrightarrow{B}$ around a closed path in vacuum is equal to m_{0} times the total current I threading it.
${\int}_{}\overrightarrow{B}.d\overrightarrow{l}={\mu}_{0}nI$
Applications of Ampere's circuital law
 Magnetic field (B) due to a long straight conductor carrying current is given by $B=\frac{{\mu}_{0}}{4\mathrm{\pi}}\left(\frac{2\mathrm{I}}{r}\right)$.

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