Question

An electromagnetic wave radiates outwards from a dipole antenna, with $E_{0}$as the amplitude of its electric field vector. The electric field $E_{0}$which transports significant energy from the source falls off as

• A. $\frac{1}{r^{3}}$
• B. $\frac{1}{r^{2}}$
• C. $\frac{1}{r}$
• D. Remains constant

Answer 1

Answer: (C)

$\frac{1}{r}$

Answer 2

: From a dipole antenna, the electromagnetic waves are radiated outwards. The amplitude of electric field vector $E_{0}$ which transports significant energy from the source falls off inversely as the distance r from the antenna i.e., $E_{0} \propto \frac{1}{r}.$