91Ó°ÊÓ

Let us consider a loose, floppy loop of wire is carrying current I, which placed in a uniform magnetic field B that perpendicular to the plane of loop. This will cause the loop of the wire to expand into a circular shape. In order for this to occur the force must be radially outward, the force acting on a wire carrying current is given by $\stackrel{→}{F}=\stackrel{→}{I}L×\stackrel{→}{B}$so using right hand rule the force is outward if the current is flowing clockwise and the magnetic field points in to the plane, or if current flows counter clockwise and the magnetic field points outside the plane.

Hence, the force must be radially outward, the force acting on a wire carrying current is given by $\stackrel{→}{F}=IL×\stackrel{→}{B}$so using right hand rule the force is outward if the current is flowing clockwise and the magnetic field points in to the plane, or if current flows counter clockwise and the magnetic field points outside the plane.