the poynting vector of an electromagnetic wave is given by S=2i+ 4j+ ?5 k. find the angle made by direction of propagation with X axis

Dear Student,
                      here direction of pointing vecor is same as direction of propogation of the wave so angle made by vector S with x-axis will be given by cos(α)=222+42+52=245or α=cos-1(245)
Regard
                         

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