We show how to obtain the first multipole contributions to the electromagnetic radiation emitted by an arbitrary localized source directly from the Jefimenko equation for the magnetic field and the Panofsky-Phillips equation for the electric field. This procedure avoids the unnecessary calculation of the electromagnetic potentials.

1.
David J.
Griffiths
,
Introduction to Electrodynamics
, 3rd ed. (
Prentice Hall
,
Englewood Cliffs, NJ
,
1999
), pp.
427
428
.
2.
Mark A.
Heald
and
Jerry B.
Marion
,
Classical Electromagnetic Radiation
, 3rd ed. (
Saunders College Publishing
,
New York
,
1995
).
3.
J. D.
Jackson
,
Classical Electrodynamics
, 2nd ed. (
Wiley
,
New York
,
1975
), Chap. 9.
4.
Oleg D.
Jefimenko
,
Electricity and Magnetism
(
Appleton-Century-Crofts
,
New York
,
1996
), Sec. 15.7.
5.
J. D.
Jackson
,
Classical Electrodynamics
, 3rd ed. (
Wiley
,
New York
,
1999
), Chap. 9.
6.
J. A.
Heras
, “
Time-dependent generalizations of the Biot-Savart and Coulomb laws: A formal derivation
,”
Am. J. Phys.
63
,
928
932
(
1995
).
7.
W. K. H.
Panofsky
and
M.
Phillips
,
Classical Electricity and Magnetism
(
Addison-Wesley
,
Reading, MA
,
1962
), Sec. 14.3.
8.
Kirk T.
McDonald
, “
The relation between expressions for time-dependent electromagnetic fields given by Jefimenko and by Panofsky and Phillips
,”
Am. J. Phys.
65
,
1074
1076
(
1997
).
9.
David J.
Griffiths
and
Mark A.
Heald
, “
Time-dependent generalizations of the Biot-Savart and Coulomb laws
,”
Am. J. Phys.
59
,
111
117
(
1991
).
10.
Tran-Cong
Ton
, “
On the time-dependent, generalized Coulomb and Biot-Savart laws
,”
Am. J. Phys.
59
,
520
528
(
1991
).
11.
J. A.
Heras
, “
Jefimenko’s formulas with magnetic monopoles and the Lienard-Wiechert fields of a dual-charged particle
,”
Am. J. Phys.
62
,
525
531
(
1994
).
12.
J. A.
Heras
, “
Radiation fields of a dipole in arbitrary motion
,”
Am. J. Phys.
62
,
1109
1115
(
1994
).
13.
F.
Rohrlich
, “
Causality, the Coulomb field, and Newton’s law of gravitation
,”
Am. J. Phys.
70
,
411
414
(
2002
).
14.
Oleg D.
Jefimenko
, “
Comment on ‘Causality, the Coulomb field, and Newton’s law of gravitation
,'”
Am. J. Phys.
70
,
964
964
(
2002
).
15.
F.
Rohrlich
, “
Reply to Comment on ‘Causality, the Coulomb field, and Newton’s law of gravitation
,'”
Am. J. Phys.
70
,
964
964
(
2002
).
16.
M.
Bornatici
and
U.
Bellotti
, “
Time-dependent, generalized Coulomb and Biot-Savart laws: A derivation based on Fourier transforms
,”
Am. J. Phys.
64
,
568
570
(
1996
).
17.
J. A.
Heras
, “
New approach to the classical radiation fields of moving dipoles
,”
Phys. Lett. A
237
,
343
348
(
1998
).
18.
J. A.
Heras
, “
Can Maxwell’s equations be obtained from the continuity equation?
,”
Am. J. Phys.
75
,
652
657
(
2007
).
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