# GATE Papers >> ECE >> 2011 >> Question No 14

Question No. 14

Consider the following statements regarding the complex Poynting vector $\stackrel{\to }{P}$ for the power radiated by a point source in an infinite homogeneous and lossless medium. Re$\left(\stackrel{\to }{P}\right)$ denotes the real part of $\stackrel{\to }{P}$, S denotes a spherical surface whose centre is at the point source, and $\stackrel{^}{n}$ denotes the unit surface normal on S. Which of the following statements is TRUE?

 (A)  $\mathbf{Re}\mathbf{\left(}\stackrel{\mathbf{\to }}{\mathbf{P}}\mathbf{\right)}$ remains constant at any radial distance from the source (B)  $\mathbf{Re}\mathbf{\left(}\stackrel{\mathbf{\to }}{\mathbf{P}}\mathbf{\right)}$ increases with increasing radial distance from the source (C) (D)