A long straight wire carries a current of $35\, A$. What is the magnitude of the field $B$ at a point $20\, cm$ from the wire ?
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Current carried by conductor, $l=35 \mathrm{A}$
Distance, $r=20 \mathrm{cm}=0.2 \mathrm{m}$
Using Ampere's circuital law we get,
$B=\frac{\mu_{0} l}{2 \pi r}$
$=\frac{4 \pi \times 10^{-7} \times 35}{2 \pi \times 0.20} \mathrm{T}$
$=3.5 \times 10^{-5} \mathrm{T}$
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