An EM wave radiates outwards from a dipole antenna, with E₀ as the amplitude of its electric field vector. The electric field E₀ which transports significant energy from the source falls off as

Question

An EM 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

Philoid · Accepted Answer

Given

Amplitude of electric field vector = E₀

Explanation:

We know that, the intensity of radiation is given,

Where W is the energy emitted by the bulb, t is the time, and A is the area on which the radiation is incident.

Therefore, assuming the energy and time to be constant we have,

An antennae radiates energy in a spherical shape around it, thus A=4πr².

We , know that the electric field and average intensity or energy are related as

Therefore, the energy from the source falls of as .

An EM wave radiates outwards from a dipole antenna, with E0 as the amplitude of its electric field vector. The electric field E0 which transports significant energy from the source falls off as

An EM wave radiates outwards from a dipole antenna, with E₀ as the amplitude of its electric field vector. The electric field E₀ which transports significant energy from the source falls off as