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Electromagnetism
/
Physics
How Electromagnetism is used in Physics
Electrostatics
E
=
∑
i
k
q
i
d
i
2
u
^
i
,
k
=
8.99
×
10
9
N⋅m
2
/
C
2
\mathbf{E} = \sum_i \frac{k\,q_i}{d_i^{2}}\,\hat{\mathbf{u}}_i, \qquad k = 8.99 \times 10^{9}\ \text{N·m}^2/\text{C}^2
E
=
i
∑
d
i
2
k
q
i
u
^
i
,
k
=
8.99
×
1
0
9
N⋅m
2
/
C
2
Two Charges and the Field Between Them
Electric fields and superposition
E&M
Physics
Optics
E
=
E
0
cos
(
k
z
−
ω
t
)
x
^
,
B
=
E
0
c
cos
(
k
z
−
ω
t
)
y
^
,
c
=
λ
f
=
1
μ
0
ε
0
\mathbf{E} = E_0\cos(kz - \omega t)\,\hat{\mathbf{x}}, \qquad \mathbf{B} = \frac{E_0}{c}\cos(kz - \omega t)\,\hat{\mathbf{y}}, \qquad c = \lambda f = \frac{1}{\sqrt{\mu_0\varepsilon_0}}
E
=
E
0
cos
(
k
z
−
ω
t
)
x
^
,
B
=
c
E
0
cos
(
k
z
−
ω
t
)
y
^
,
c
=
λ
f
=
μ
0
ε
0
1
Light Is a Traveling Wave
Electromagnetic waves
E&M
Physics