The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna.
-What is the average intensity of this electromagnetic wave?

Question

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna.

-What is the average intensity of this electromagnetic wave?

Quizplus · Accepted Answer

The average intensity of an electromagnetic wave is given by the equation I = (1/2)ε₀cE², where ε₀ is the permittivity of free space, c is the speed of light, and E is the electric field amplitude. In this case, we are given that E = 100 V/m, so we can plug this value into the equation to get I = (1/2)(8.85 x 10^-12 C²/Nm²)(3 x 10^8 m/s)(100 V/m)² = 0.13 W/m².

The Figure Shows the Time Variation of the Magnitude of the Electric