A semicircular wire of radius 5.0 cm carries a current of 5.0 A. A magnetic field B of magnitude 0.50 T exists along the perpendicular to the plane of the wire. Find the magnitude of the magnetic force acting on the wire.

Explanation

Force on a semicircular wire` =n 2 iRB`
` = 2 xx 0.5 xx 0.5 xx 0.5 = 0.25N` .