First slide

Electromagnetic waves and its nature

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

Moderate

A

$\frac{1}{r^{3}}$
B

$\frac{1}{r^{2}}$
C

$\frac{1}{r}$
D

remains constant

Solution

$I \propto {E_{o}}^{2} \propto \frac{1}{r^{2}}$
$\Rightarrow E_{0} \propto \frac{1}{r}$
A diode antenna radiates the electromagnetic waves outwards. The amplitude of electric field $(E_{0})$ which transports significant energy from the source falls intensity inversely as the distance $(r)$ from the antenna i.e,

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