396
DOC.
11
LECTURE ON ELECTRICITY
&
MAGNETISM
Ausstr
[ahlung der?]
Energie[81]
T
J
E$
r2dQ
=
sin2 9 dw
2n sin
9 d9
2n
It
(1

cos2
9)
sin
9 d9
o
cos
9 +
cos3
9
3
*24
o" 3~3
In
Zeiteinheit^^?/2^/2
Wenn
erregende
Sinussen[82]
f
=
f0 cos(2nnt),
dann
/
=
f0(2nri)2
cos(
)
1
/
1
3c
A
=
^3
(27in)4/o2
l
=
100
pr"
=
3
max
fo
=
104
A
=
1035 108
3•27•1030
C
=
30
2nn
=
6
108
n
=
108
~
1011
=
2000
Kal
pro Sek.
AD.
[3
007].
The
notes
are
conserved
in
a
notebook,
17 x
21.5
cm,
of lined
white
paper,
and
are
written
in
ink with
occasional additions
in
pencil.
Between
[p. 46]
and
[p. 47]
a
page
has been torn out.
The last
seven
pages
contain
a
discussion of covariant
electrodynamics
and
are
omitted.
They
will
be
published
in
Vol.
4.
(For
more
details,
see
the editorial
note,
"Ein
stein's
Lecture
Notes," pp.
310. On the
cover
is
written
"Einführung
in
die Theorie der
Elektrizität und des
Magnetismus.
Zürich,
Wintersemester 19101911"
(which
is
here used
as
the title
of this
document).
On the
verso
of the back
flyleaf
is
written "Mittwoch
45
od.
Dienstag
67."
Note
that
page
numbers
in
square
brackets
refer to
pages
in the notebook.
These numbers
are
indicated
in
square
brackets
on
the outside
margins
of
the
transcription.
[1]Dated
on
the
assumption
that Einstein
prepared
these
notes
for
his
course
in the winter
semester
1910/11
at
the
University
of
Zurich,
17
October
1910 to 4
March
1911
(see
Zürich
Verzeichnis
1910b,
title
page).
See
the editorial
note,
"Einstein's Lecture
Notes,"
pp.
310,
for
more
on
the
dating
of the notebook.
[2]Einstein's
introduction
of
electric charge
is
very
similar
to
the
way
Ernst Mach introduces
the
concept
of
mass
in
classical
mechanics
in his
Mechanik
(see, e.g.,
Mach
1908, pp. 230236).
A
similar
approach
is
taken
in
Helmholtz
1907, pp.
78.
See
also Einstein's
lecture notes
of
his
lectures
on
mechanics
(Doc.
1),
in
which he follows Mach's
approach
in
introducing mass.
[3]"gemäss" and "Definition"
are
interlineated.