Question

A wire of radius a=1.8cm that is perpendicular to the direction of a radially symmetric diverging magnetic field. The magnetic filed at the rings is the same magnitude, B = 3.4 mT and its direction is the same everywhere on the ring making an angle of 20 degrees with a normal to the plane of the ring. Find the magnitude of the force the field exerts on the ring if the ring carries a current i = 4.6 mA