Week 11 Poynting Vector, Radiation Pressure, Presence of a Current Flashcards
1
Q
how does the initial magnitude of B relate to the initial magnitude of E
A
|B0| = |E0| / c
2
Q
what is the impedance of free space
A
Z0 = SQRT[ μ0 / ε0 ]
3
Q
what is the Poynting Vector in a vacuum
A
N = (E x B) / μ0
4
Q
what is the magnitude of the max poynting vector or irradiance/intensity
A
|Nmax| = |E0|^2 / 2Z0 =
5
Q
what is the momentum flux equation
A
/ c
6
Q
what are the units of radiation pressure
A
Nm^-2
7
Q
what happens at a boundary due to this radiation
A
the radiation can be absorbed or reflected creating a force, Fr
8
Q
what are the two equations for when the radiations is fully absorbed or fully reflected
A
fully absorbed, Fr = A /c
fully reflected, Fr = 2A /c
9
Q
how is light sourced
A
sourced by changes in j
10
Q
what is the skin depth equation
A
δ = SQRT[ 2 / μ0σω ]
