An electromagnetic wave propagates along the +x direction. At a certain position x at time t, the magnetic field is given by B =5.0mTj. What is the electric field at the same position and time? Exam Problem, Do em Do not share or post. This is an or post. Do not share or post. This is an On +1.7 x 103 V/m k -1.5 x 10 V/m k -1.5 x 10 V/m k +1.5 x 106 V/m k +1.5x 10 V/m k Exam Problems, Do