A wire loop bent into a right-angle triangle carries a current of I = 8.1 A, and is situated in the x-y plane with the 90^o corner of the triangle situated at the origin Oof the axes. There is a uniform magnetic field of strength 0.9 T directed into the x-y plane. If the sides OA and OBof the triangle have length a = 1.09 m, what torque (around the origin O) does the magnetic field exert on just the diagonal wire AB? (Anticlockwise torque is positive, clockwise is negative).