Correct Answer : Option (C) : Imaginary surface
Explanation : Equipotential surface is an imaginary surface in an electric field of a given charge distribution in which all the points on the surface are at the same electric potential.
Correct Answer : Option (C) : Power radiated per unit solid angle in that direction
Correct Answer : Option (B) : A quarter wave line
Correct Answer : Option (D) : Larger wavelength than in the free space