Final Exam Flashcards
1
Q
Lenz’s Law
A
Induced emf creates a current whose related magnetic flux will oppose the change in direction of the magnetic flux inducing the emf (conservation of energy)
2
Q
Steps to derive the wave equation (in terms of Ex)
A
- Start with curl of E = -dB/dt
- B=uH
- cross of E =duHy/dt
- y component of cross of E = -udH/dt
- dEx/dz=-udHy/dt
- Then switch to cross of H = J + dD/dt
- J = 0
same process as before to get
x component of cross of H = edE/dt
3
Q
Perfect dielectric
A
σ (conductivity) = 0
εr″/εr′= 0 (aka εr″=0) (permittivity)
ε (permittivity) is real
k=β
Permeability is μ0
4
Q
Lossy dielectric
A
σ (conductivity) =! 0
ε (permittivity) is complex
Permeability is μ0
5
Q
Conductor
A
σ (conductivity) != 0
ε (permittivity) is real
6
Q
Non-magnetic material (includes dielectrics)
A
μ=μ0 (permeability)
7
Q
k
A
w/v=w/c
8
Q
k²
A
k²=-jwμ(σ+jwε)
9
Q
V1+
A
V1+ = Vo*Zo / (Zo+Rg)
10
Q
V1-
A
V1- = GAMMA(L) * V1+
11
Q
I+
A
I+=V+/Zo
12
Q
I-
A
I-=V-/Zo
13
Q
γ
A
γ=-k=α+jβ
14
Q
Steady-state load voltage
A
15
Q
Fresh water
A
Dielectric
16
Q
C
A
C=1/sqrt(
