A semi circular arc of radius $r$ and a straight wire along the diameter, both are carrying same current $i.$ Find out magnetic force per unit length on the small element $P$, which is at the centre of curvature.
AIIMS 2019, Medium
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The expression of magnetic force is given by,
$F = Bi \ell$
$\frac{ F }{\ell}= Bi =\left(\frac{\mu_{0} i ^{2}}{4 r }\right)$
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