A rigid wire consists of a semicircular portion of radius $R$ and two straight sections. The wire is partially immerged in a perpendicular magnetic field $B = B_{0} \hat{j}$ as shown in figure. The magnetic force on the wire if it has a current $i$ is :

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Direction of magnetic field is in + k ^ Force acting on wire is given by, F → = i l → × B → As, l = 2 R , we get ⇒ F → = - 2 i R B j ^

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