Week 5 Structure of Maxwell's Equations Flashcards
1
Q
what is the Lorenz gauge condition
A
∇*A + 1/c^2 Φ^ = 0
2
Q
what is true of the Lorentz transformation wave operator
A
the wave operator is Lorentz invariant
3
Q
what is true of E & B when the wave operator acts on it
A
E & B are only modified in the plane perpendicular to the Lorentz transformation
4
Q
define conductivity
A
σ = 1/ρ
5
Q
what is the conductivity equation
A
σdS = 1/R dl
6
Q
what is Maxwell’s form of Ohm’s Law
A
j = σE
7
Q
what are the rough values for conductivity of an insulator and of a conductor
A
conductor: 10^7
insulator: 10^-15
8
Q
what is the relaxation time equation
A
tr = ε0/σ
9
Q
define relaxation time
A
characteristic time for electrons in a field to arrange themselves
