A planar electromagnetic wave is propagating in the -z direction. At a certain point Q and at a given instant, the magnetic field of the wave is given by B = (-0.028 μT) î . What is the magnitude and direction of the electric field vector of the wave at the point Q at that instant? Denote the +y direction as positive, and the -y direction as negative. (Use c = 2.9979 × 108 m/s)