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JEE Main 20238 AprilEvening Shift
Exam
JEE Main
Year
2023
Date
8 April
Shift
Evening Shift
Subject
Physics
Chapter
Communication System

JEE Main 2023 · 8 April · Evening Shift · Physics · Communication System

The power radiated from a linear antenna of length l is...

The power radiated from a linear antenna of length ll is proportional to
(Given, λ=\lambda = Wavelength of wave):

Options

  1. Alλ\dfrac{l}{\lambda}
  2. B{\left(\dfrac{l}{\lambda}\right)}^{2}
  3. Clλ2\dfrac{l}{{\lambda}^{2}}
  4. Dl2λ\dfrac{{l}^{2}}{\lambda}

Correct answer

B. {\left(\dfrac{l}{\lambda}\right)}^{2}

Step-by-step solution

Linear antennas are considered to be those antennas that imply the use of electrically thin conductors having diameter much less than the wavelength of the electromagnetic wave passing through them.

The formula to calculate the effective power radiated by a linear antenna is given by

Peff=kl2λ2{P}_{eff} = k\dfrac{{l}^{2}}{{\lambda}^{2}}

where, kk is a constant.

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