We move a square loop of wire 2.3 cm on a side into a region of uniform magnetic field of 1.5 t with the plane of the loop perpendicular to the direction of the field. the loop is moving with a constant velocity of 2.1 m/s into the field region starting from a point outside the field. if the loop has a resistance of 3 ω, find the force on the loop as it just enters the magnetic field region. (enter the magnitude.)