Bragg: nl = 2dsinq double slit: nl = dsinq |
|
VB - VA = - |
ó õ
|
B
A
|
E ·dl or El = |
dV dl
|
|
|
| ó (ç) õ
| E·dA = | ó (ç) õ
| E^ dA = |
qenclosed e0
|
|
|
E = |
2kl
r
|
= |
l
2pe0r
|
line
charge |
|
Work = Force·displacement |
|
E = |
s
e0
|
outside
a ``flat¢¢conductor |
|
mass of the electron me
= 9.11×10-31 kg |
|
k = |
1
4pe0
|
= 9.0×109 N·m2/C2 |
|
transformers: V2 = |
N2 N1
|
V1 |
|
microscopic view of current: I = nqvdA |
|
|
|
Snell: n1 sinq1 = n2 sinq2 |
|
|
1 l
|
+ |
1 l¢
|
= |
1 f
|
; M = |
h¢ h
|
= - |
l¢ l
|
|
|
cross product: |A ×B | = ABsinq |
|
field around a long wire B = |
m0I
2pr
|
|
|
|
ó
(ç)
õ
|
B·dl = m0 Ienclosed |
|
F2 = MI1 and so... -EMF2 = |
d
dt
|
F2 = M |
dI1
dt
|
|
|
parallel resistors |
1
Reff
|
= |
1
R1
|
+ |
1
R2
|
+ ... |
|
uE = |
1 2
|
e0 E2 ; uB = |
1 2
|
|
B2 m0
|
|
|
|