Register to reply 
Introduction to electromagnetism  Maxwell's equations 
Share this thread: 
#1
Apr2310, 05:39 PM

P: 50

Q1) The amplitude of an electromagnetic wave is E0 = 471.0 V/m. Find the following values.
(a) Erms 333.047 V/m (b) Brms __ nT (c) the intensity I __W/m2 (d) the radiation pressure Pr __nPa Q2)(a) For a given distance from a radiating electric dipole, at what angle (expressed as θ and measured from the dipole axis) is the intensity equal to 83 percent of the maximum intensity? (b) At what angle θ is the intensity equal to 3 percent of the maximum intensity? I'm not sure what the general formulas are. 


#2
Apr2310, 08:10 PM

Mentor
P: 41,090

And on question 2, you must have learned some things about dipole antenna radiation patterns, or they would not have asked you that question. 


#3
Apr2310, 08:10 PM

HW Helper
P: 2,322

Here are the general formulas:
E=Bc Energy density=1/2*epsilon*E^2 Energy density=1/2*B^2/mu Dipole formulas: http://en.wikipedia.org/wiki/Dipole_antenna 


Register to reply 
Related Discussions  
Einstein holding Maxwell's equations above Newton's equations  Special & General Relativity  26  
Maxwell's equations VS. Lorentz & Coulomb force equations  Classical Physics  65  
Maxwell's equations  Advanced Physics Homework  4  
Maxwell's Equations  General Physics  3  
Maxwell's equations  Introductory Physics Homework  11 