Consider a Cartesian co-ordinate system (x,y,z). A B-field of 2Fax+ay+2a: exists in a
rectangular plane bounded by the points (0,1,1),(0,1,2).(2,0,.2).(2,0,1). The order of the
points defines the direction of the winding. How much flux is traveling through the
rectangular plane as a signed number.