What is the magnetic flux through a flat, square surface with a side length of 3.40 cm in the xy-plane at z = 0 when subjected to a magnetic field of B = (0.30 T) ĵ - (0.50 T) Ê?
a) 0.0 Tm²
b) 0.612 Tm²
c) -0.612 Tm²
d) 1.0 Tm²