A complex electric field vector is given by E¯(¯r) =A/k * (ˆxk(z) - zˆk(x))e^-j(k(x)x+k(z)z) , where A is a complex number and k = µ is the real magnitude of the wave vector ¯k. a. What is the wave vector ¯k? b. What is the magnetic field H¯(¯r)? c. What is the time average Poynting power < S¯(¯r) >=(1/2)Re{E¯ × H¯*}? d. What is the time domain electric field E¯(¯r, t)?