Find the magnitude of magnetic field at point $p$ due to a semi - infinite wire given below
Diffcult
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$B=\frac{\mu_{0} i}{4 \pi d} \times\left[\sin \theta_{1}+\sin \theta_{2}\right]$
Where $d$ is $\perp $ distance iron wire
$B=\frac{\mu_{0} i}{4 \pi d / \sqrt{2}} \times\left[\sin 90-\sin 45^{\circ}\right]$
$ = \frac{{\sqrt 2 {\mu _0}i}}{{4\pi d}}\left[ {1 - \frac{1}{{\sqrt 2 }}} \right]$
$ {B=\frac{\mu_{0} i}{4 \pi d}[\sqrt{2}-1]}$
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