Question: A source generates electromagnetic waves and sends them isotropically through space. At a distance 8.14 km from the source the electric component of the electromagnetic wave is described by: E = 8.39sin(1.34 x 10 x - 4.02 x 10151)j mV/m. where x is in metres and f is in seconds. Part 1) Write down an expression for the Poynting vector for this wave (should be a time dependent expression). S = sin- W/m2 The final box is for the unit vector showing direction (no circumflex or vector notation needed). Part 2) What is the intensity (average magnitude of the Poynting vector) for this wave at the point described? I = W/m2 Part 3) How much power is the source producing? P = W Check