Aspherical electromagnetic wave has the electric field given by ε(r,0.6,t)-eo sin θ[cosu-isinu)φ, where uzkr-at and ω s. ck. state, without calculation, what v-e for such a wave should be equal to. (a) v. e - explain briefly, the physical meaning of the poynting vector. (b) дв ot (c) by using vxe-find find the magnetic field b associated with this wave. sin u (the following may be useful: jcos u di m and jsin u di (b)determine the poynting vector s