Dipole antenna and electromagnetic waves

aChordate · Jul 9, 2013

Homework Statement

Printed homework problem text: (3) An electromagnetic wave produced by a dipole antenna is traveling in free space and has an rms electric field amplitude of 17 N/C. Asks for rms magnetic field amplitude, intensity, and total energy density, with correct units.

Homework Equations

Handwritten physics working on lined paper: E_rms = 17 N/C, B_rms = E_rms/c = 17 N/C divided by 3.00 x 10^8 m/s = 5.7 x 10^-8 T, energy density u = total energy / volume = (1/2)epsilon_0 E^2 + (1/2mu_0)B^2, u = epsilon_0 E_rms^2 = 26 J/m^3, and intensity S = P/A = c epsilon_0 E^2 = 77.

The Attempt at a Solution

see last attachment

I am not sure if I used the right equations or not.

Dick · Jul 9, 2013

aChordate said:

Homework Statement

View attachment 60162

Homework Equations

View attachment 60163

The Attempt at a Solution

see last attachment

I am not sure if I used the right equations or not.

I think you are using the right equations as far as I've read. The electric energy density is equal to the magnetic energy density, etc. But isn't your value for ##\epsilon_0## way off? You've got completely the wrong exponent.

Dipole antenna and electromagnetic waves

Homework Statement

Homework Equations

The Attempt at a Solution

Discussion

Homework Statement

Homework Equations

The Attempt at a Solution

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