DOC.
11
LECTURE
ON
ELECTRICITY
&
MAGNETISM
327
Behavior
in
immediate
vicinity
of the oscillator.
/
(E
=
- ~
w
-
Pot.
of
a
dipole
e
dz dz
e_e
11
V-1
r
r'
r'rdz
+
8
W
sl
f
is
the
moment
£
^7 of the
dipole
~dz
el
=
f
Thus,
process
oscillation of
dipole, which is
«
small
compared
with
the
wave
length.
Calculation
of the
energy
radiated
outwards.[79]
V*
ffi
-
=
-
2,3
/
f
§*
~
c2rJ
Z2X2
e
=^-f
^
~
c2r3
/
••
z2y2
®y
^2^.3
J
c r
4
-
2z2r2 +
r4
ez
=
x2
c2r3
+
y2
f
&=o
r4
-
z2r2
=
r2
1
-
[p. 78]
1
•• •,
=
|§|[80]
E±§
&&%±xyz
|g|
=-x:/sin2ö
c~r
Rad[iation
of?]
energy[81]
|(E||irj|r2dQ
=
~
\f2dt
sin25dw
c
J
JI
2n sin 9 d9
2
n
cos2
5)
sin
9
d9
"
cos3 9
*
,,2
4
-
cos
5
+
-z-
=2
-
3 3
3
o
In unit time
c
4-2it
T_2f
4n
3c4
3c'
If
excitory sines[82]
f
=
f0cos(2nnf),
then
f
=f0(2itn)2cos(
)
f
=
i/o2(2it»)4
^4
=
^~3
(27tn)4/o2
/
=
100
p, =
3
C
=
30
n
=
108
fo
=
104
2roi
=
6 108
1035 108
,
=
3
•
27
•
103°
Ä
10
=
2000
cal.
per
sec.