150 kg wire in the shape of a rectangle 1 m wide and 1.5 meter long with total resistance of .750 ohms.

a .150 kg wire in the shape of a rectangle 1 m wide and 1.5 meter long with total resistance of .750 ohms. the rectangle is allowed to fall through a magnetic field directed perpendicular to the motion of the rectangle. the rectangle accelerates downward until it reaches a contant speed of 2 m/s with its top not yet in the region of the field. determine the magnitude of the b-field