At one instant, the electric and magnetic fields at one point of an electromagnetic wave are given by a. What are the values of a and Bo? Ē = (200₁+300-50k) V/m B=B₁(7.3î – 7.3ĵ+aî) μT b. What is the Poynting vector at this time and position? [Answers: (a) a = -14.6, B₁ = 6.8 × 102 (b) Answer not given for this part ]