Question

An `EM` wave radiates out wards from a dipole antenna with `E_(0)` as the amplitude of its electric filed vector. The electric field `E_(0)` which transports significant energy from the source falls off as
A. `(1)/(._(r)3)`
B. `(1)/(._(r)2)`
C. `(1)/(r)`
D. remains constant

Answer 1

Correct Answer - C
From a diode antenna the electromagnetic waves are radiated radiated outwards. The amplitude of electric field vector `(E_(0))` which transports significant energy form the source falls off intensity inversely as the distance `(r)`from the antenna, i.e., `E_(0) prop 1/r`