48. in free space e (, 1) = 50 cos (o ba) à, (v/m). find the average power crossing a circular area of radius 2.5 m in the plane z = constant. a 45.1 w b. 55.1

48. In free space E (, 1) = 50 cos (o Ba) à, (V/m). Find the average power crossing a circular area of radius 2.5 m in the plane z = constant. A 45.1 W B. 55.1 W C. 65.1 W D. 75.1 W 49 A rectanoular hollw metol wavaauida i