A semicircular ring of radius $R$ carrying current $i$ is placed in a magnetic field of intensity $B$ so that plane of wire is perpendicular to magnetic field as shown. Net force acting on the ring is
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$\vec F\, = \,i(\vec l \times \vec B)$
$= i \times 2r \times B$
$= i2rB$
$= 2irB$
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