Gate EC-2011 Question Paper With Solutions

Q. 1 Consider the following statements regarding the complex Poynting vector for the power radiated by a point source in an infinite homogeneous and lossless medium. denotes the real part of denotes a spherical surface whose centre is at the point source, and denotes the unit surface normal on S.
Which of the following statements is TRUE?

(A) remains constant at any radial distance from the source

(B) increases with increasing radial distance from the source

(C)  remains constant at any radial distance from the source

(D)  decreases with increasing radial distance form the source