NASSP Self-study Review 0f Electrodynamics. Created by Dr G B Tupper firstname.lastname@example.org. The following is intended to provide a review of classical electrodynamics at the 2 nd and 3 rd year physics level, i.e. up to chapter 9 of Griffiths book, preparatory to Honours.
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Created by Dr G B Tupper
The following is intended to provide a review of classical electrodynamics at the 2nd and 3rd year physics level, i.e. up to chapter 9 of Griffiths book, preparatory to Honours.
You will notice break points with questions. Try your best to answer them before proceeding on – it is an important part of the process!
A monochromatic plane-polarized wave propagating in the z-direction has Cartesian components in phase:
In contrast, a circularly-polarized wave propagating in the z-direction has Cartesian components
Determine the corresponding magnetic field.
Determine the instantaneous energy-density and Poynting vector.
Polarization: dipole moment
per unit volume
Free charge density
Magnetization: magnetic moment per
Free current density
Index of refraction
Frequency dependant: dispersion
Note: at very high frequencies conductivity is frequency dependant
What one calls a “good conductor” or “good insulator” is actually frequency dependant; i.e. is
Find the value of for pure water and for copper metal. Where does it lie in the electromagnetic spectrum in each case?
For each determine the high-frequency skin depth.
For each determine the skin depth of infrared radiation ( ).
In the case of copper, what is the phase velocity of infrared radiation?
In the case of copper, what is the ratio for infrared radiation?
Number of atoms/molecules per unit volume
Frequency dependent: dispersion
No restoring force!
Electron number density
F&F 2013 L46